dbusctl set-property log says command failed, but property value got updated

[branupama]

dbusctl set-property log says command failed, but still property value got updated.

Commands I tried:

root@p10bmc:~# busctl introspect com.ibm.VPD.Manager /com/ibm/VPD/Manager com.ibm.VPD.Manager
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
.CollectFRUVPD method o - -
.GetExpandedLocationCode method sq s -
.GetFRUsByExpandedLocationCode method s ao -
.GetFRUsByUnexpandedLocationCode method sq ao -
.GetHardwarePath method o s -
.PerformVPDRecollection method - - -
.ReadKeyword method sv v -
.WriteKeyword method sv i -
.deleteFRUVPD method o - -
.CollectionStatus property s "InProgress" emits-change writable

---

root@p10bmc:~# busctl set-property com.ibm.VPD.Manager /com/ibm/VPD/Manager com.ibm.VPD.Manager CollectionStatus s "Completed"
Failed to set property CollectionStatus on interface com.ibm.VPD.Manager: Invalid argument

---

root@p10bmc:~# busctl introspect com.ibm.VPD.Manager /com/ibm/VPD/Manager com.ibm.VPD.Manager
NAME TYPE SIGNATURE RESULT/VALUE FLAGS
.CollectFRUVPD method o - -
.GetExpandedLocationCode method sq s -
.GetFRUsByExpandedLocationCode method s ao -
.GetFRUsByUnexpandedLocationCode method sq ao -
.GetHardwarePath method o s -
.PerformVPDRecollection method - - -
.ReadKeyword method sv v -
.WriteKeyword method sv i -
.deleteFRUVPD method o - -
.CollectionStatus property s "Completed" emits-change writable