ActiveDirectory 1005 (CONSTRAINT_ATT_TYPE) - manager

Hi

This is on Windows2012R2

I am trying to modify the "manager" property, to add a value but I keep getting:

"0: 000020B5: DSID-03152C47, problem 1005 (CONSTRAINT_ATT_TYPE), data 0, Att 15000a (manager)"

I am not sure if that is a constrain at schema level.

Any tips on how to do this?

I would like to use the default properties before creating new ones.

thanks!