Error when creating a new Entity Sync to an Existing Target Entity

Hi,

I managed to create Entity Syncs for many existing Entities but I have a bunch of Entities where I cannot seem to get Sync to work properly.

I get the following fail:

The last sync failed with error message : Initial sync of the entity has failed. The target entity contains at least one attribute that does not match a source entity attribute. Name of the first attribute that does not match a source entity attribute:...

I have checked the all the Column names and types, entity properties, etc. and I always get the same error.

Does anybody have an idea about what is wrong?

Thank you.