Prevention of synchronization if depedency is not available / valid

[bielu]

Is your feature request related to a problem? Please describe.
Hey this both feature request and question, is it possible to validate document by depedency?
Describe the solution you'd like
Being able to say some document/media/form is invalid when preparing usync pull/push.

Describe alternatives you've considered
using usync notifications (uSyncImportingItemNotification and uSyncImportedItemNotification)

Additional context
We have custom rule on media which prevents it from being routable, and we would like to be able to prevent sync as long this media not passing validation (I can do directly on item), but can i prevent it from creating whole sync even if item is not main exported item, but depedency?

[KevinJump]

Just to get my head around this.

Is this
a) you push a media item and it shouldn't be pushed because it is of a certyain type.
or
b) you push a content item that contains a media item, and you don't want the media item and/or the media item to be published because of the media item being a certain type ?

I suspect you mean a) but i wanted to check.

[bielu]

@KevinJump in this case, we want prevent it base on 2 properties, one or other has to be populated, if not - they are not valid and they shouldn't be sync.
So both cases of specific item shouldn't be pushed and any content referencing it also should be blocked,