diff --git a/src/model/Spec.ts b/src/model/Spec.ts
index 864557a..95501f8 100644
--- a/src/model/Spec.ts
+++ b/src/model/Spec.ts
@@ -169,12 +169,15 @@ export default class Spec {
     const isDirectRef = this.isRef(operationFieldValue);
     const schemaValue = isDirectRef ? operationFieldValue : operationFieldValue.content['application/json'].schema;
 
-    if (!this.isRef(schemaValue)) return operationFieldValue;
-
-    const name = this.getRefComponentName(schemaValue);
-    const hasChildren = mappings.has(name);
-
-    if (!hasChildren) return operationFieldValue;
+    let schema;
+    if (this.isRef(schemaValue)) {
+      schema = this.buildOneOfSchema(schemaValue, mappings)
+    } else if (this.containsItems(schemaValue)) {
+      schema = {
+        ...schemaValue,
+        items: this.buildOneOfSchema(schemaValue.items, mappings)
+      }
+    } else return operationFieldValue;
 
     return {
       ...operationFieldValue,
@@ -182,9 +185,7 @@ export default class Spec {
         ...operationFieldValue.content,
         'application/json': {
           ...operationFields.requestBody.content['application/json'],
-          schema: {
-            oneOf: this.buildOneOfList(mappings.get(name))
-          }
+          schema: schema
         }
       }
     };
@@ -199,12 +200,15 @@ export default class Spec {
 
       const schemaValue = isDirectRef ? responseFields : responseFields.content['application/json'].schema;
 
-      if (!this.isRef(schemaValue)) return [response, responseFields];
-
-      const name = this.getRefComponentName(schemaValue);
-      const hasChildren = mappings.has(name);
-
-      if (!hasChildren) return [response, responseFields];
+      let schema;
+      if (this.isRef(schemaValue)) {
+        schema = this.buildOneOfSchema(schemaValue, mappings)
+      } else if (this.containsItems(schemaValue)) {
+        schema = {
+          ...schemaValue,
+          items: this.buildOneOfSchema(schemaValue.items, mappings)
+        }
+      } else return [response, responseFields];
 
       return [response, {
         ...responseFields,
@@ -212,18 +216,27 @@ export default class Spec {
           ...responseFields.content,
           'application/json': {
             ...responseFields.content['application/json'],
-            schema: {
-              oneOf: this.buildOneOfList(mappings.get(name))
-            }
+            schema: schema
           }
         }
       }];
     });
   }
 
+  private buildOneOfSchema(schemaValue: Value, mappings: Record<Key, Value>): Record<Key, Value> {
+    const name = this.getRefComponentName(schemaValue);
+    const hasChildren = mappings.has(name);
+
+    if (!hasChildren) return schemaValue;
+
+    return {
+      oneOf: this.buildOneOfList(mappings.get(name))
+    }
+  }
+
   private buildOneOfProperty(properties: Value, mappings: Record<Key, Value>): Record<Key, Value> {
     const updateProperty = (value: Value) => {
-      if (!this.isRef(value)) return value;
+      if (!this.isRef(value)) return this.containsItems(value) ? this.buildOneOfProperty(value, mappings) : value;
 
       const name = this.getRefComponentName(value);
       const hasChildren = mappings.has(name);
@@ -289,6 +302,8 @@ export default class Spec {
 
   private isRef = (value: Value): boolean => value && value.hasOwnProperty('$ref');
 
+  private containsItems = (value: Value): boolean => value && value.hasOwnProperty('items');
+
   private filterHeaderParameters = (parameters: Value, headersToRemove: string[]) => {
     return parameters.filter(
       (parameter: Record<Key, Value>) => parameter.in !== HEADER || !this.includesIgnoreCase(headersToRemove, parameter.name)
diff --git a/test/transformer/OneOfSettingTransformer.test.ts b/test/transformer/OneOfSettingTransformer.test.ts
index 6fa5c43..ec459ba 100644
--- a/test/transformer/OneOfSettingTransformer.test.ts
+++ b/test/transformer/OneOfSettingTransformer.test.ts
@@ -177,6 +177,23 @@ describe(' test OneOfSettingTransformer', () => {
               }
             }
           }
+        },
+        '/another/test': {
+          post: {
+            requestBody: {
+              required: true,
+              content: {
+                'application/json': {
+                  schema: {
+                    type: 'array',
+                    items: {
+                      $ref: '#/components/schemas/PaymentMethod'
+                    }
+                  }
+                }
+              }
+            }
+          }
         }
       },
       ...components
@@ -212,6 +229,36 @@ describe(' test OneOfSettingTransformer', () => {
               }
             }
           }
+        },
+        '/another/test': {
+          post: {
+            requestBody: {
+              required: true,
+              content: {
+                'application/json': {
+                  schema: {
+                    type: 'array',
+                    items: {
+                      oneOf: [
+                        {
+                          $ref: '#/components/schemas/PayPal'
+                        },
+                        {
+                          $ref: '#/components/schemas/Mastercard'
+                        },
+                        {
+                          $ref: '#/components/schemas/Debit'
+                        },
+                        {
+                          $ref: '#/components/schemas/Credit'
+                        }
+                      ]
+                    }
+                  }
+                }
+              }
+            }
+          }
         }
       },
       ...components
@@ -270,6 +317,23 @@ describe(' test OneOfSettingTransformer', () => {
               }
             }
           }
+        },
+        '/another/test': {
+          post: {
+            requestBody: {
+              required: true,
+              content: {
+                'application/json': {
+                  schema: {
+                    type: 'array',
+                    items: {
+                      $ref: '#/components/schemas/Dummy'
+                    }
+                  }
+                }
+              }
+            }
+          }
         }
       },
       ...components
@@ -305,6 +369,19 @@ describe(' test OneOfSettingTransformer', () => {
                     }
                   }
                 }
+              },
+              '404': {
+                description: 'Not Found',
+                content: {
+                  'application/json': {
+                    schema: {
+                      type: 'array',
+                      items: {
+                        $ref: '#/components/schemas/PaymentMethod'
+                      }
+                    }
+                  }
+                }
               }
             }
           }
@@ -352,6 +429,32 @@ describe(' test OneOfSettingTransformer', () => {
                     }
                   }
                 }
+              },
+              404: {
+                description: 'Not Found',
+                content: {
+                  'application/json': {
+                    schema: {
+                      type: 'array',
+                      items: {
+                        oneOf: [
+                          {
+                            $ref: '#/components/schemas/PayPal'
+                          },
+                          {
+                            $ref: '#/components/schemas/Mastercard'
+                          },
+                          {
+                            $ref: '#/components/schemas/Debit'
+                          },
+                          {
+                            $ref: '#/components/schemas/Credit'
+                          }
+                        ]
+                      }
+                    }
+                  }
+                }
               }
             }
           }
@@ -415,6 +518,19 @@ describe(' test OneOfSettingTransformer', () => {
                     }
                   }
                 }
+              },
+              '201': {
+                description: 'Created',
+                content: {
+                  'application/json': {
+                    schema: {
+                      type: 'array',
+                      items: {
+                        $ref: '#/components/schemas/Dummy'
+                      }
+                    }
+                  }
+                }
               }
             }
           }
@@ -458,6 +574,12 @@ describe(' test OneOfSettingTransformer', () => {
               },
               paymentMethod: {
                 $ref: '#/components/schemas/PaymentMethod'
+              },
+              paymentMethods: {
+                type: 'array',
+                items: {
+                  $ref: '#/components/schemas/PaymentMethod'
+                }
               }
             }
           }
@@ -509,6 +631,25 @@ describe(' test OneOfSettingTransformer', () => {
                     '$ref': '#/components/schemas/Credit'
                   }
                 ]
+              },
+              paymentMethods: {
+                type: 'array',
+                items: {
+                  'oneOf': [
+                    {
+                      '$ref': '#/components/schemas/PayPal'
+                    },
+                    {
+                      '$ref': '#/components/schemas/Mastercard'
+                    },
+                    {
+                      '$ref': '#/components/schemas/Debit'
+                    },
+                    {
+                      '$ref': '#/components/schemas/Credit'
+                    }
+                  ]
+                }
               }
             }
           }
@@ -551,6 +692,12 @@ describe(' test OneOfSettingTransformer', () => {
               },
               paymentMethod: {
                 $ref: '#/components/schemas/Dummy'
+              },
+              dummies: {
+                type: 'array',
+                items: {
+                  $ref: '#/components/schemas/Dummy'
+                }
               }
             }
           }
@@ -589,6 +736,12 @@ describe(' test OneOfSettingTransformer', () => {
               },
               paymentMethod: {
                 $ref: '#/components/schemas/Dummy'
+              },
+              dummies: {
+                type: 'array',
+                items: {
+                  $ref: '#/components/schemas/Dummy'
+                }
               }
             }
           }