Unable to merge a plugin with a master

[bibendovsky]

Hello.

 

Trying to get familiar with merging procedure in Creation Kit.

 

I created a test plugin file with a one form and successfully builded a master file:

 

Then added this form in the location and saved changed into a plugin:

 

On check in dialog with a problem description appeared:

 

Proceeding with "Check In Remaining Forms" does not move forms into a master file.

 

Is there is a way to fix it?