Powershell connector. Merge mode for members of UNSGroupB

Hello! 

1IM 8.1 SP3. 

I have created Powershell connector to Apache Ranger system. 

I turned on Merge mode for UNSAccountBInUNSGroupB table in Custom System target type Apache Ranger.

For UNSGroupB schema class (Left side) I made virtual attribute M:N VRT_MembersArr (UNSAccountBInUNSGroupB) with  "Enable releative complement handing" checkbox.

For "groups" Apache Ranger (Right side) I have multi-value attribute multi-value  arrUserID.

Mapping rule is type "Multi-reference mapping rule". 

In the Mapping rule I see warnings:

"The property (VRT_MembersArr@UNSGroupB) references objects of schema type (User accounts). There is no mapping for this schema type, which was defined many-to-many mapping"

"The property (arrUserID@Groups) references objects of schema type (User). There is no mapping for this schema type, which was defined many-to-many mapping"

Provisionning send all members to Apache Ranger. 

How can I do that Provisionning only send Add or Remove members granularly?