Hello Vara5a3, Here is a link to kb that explains how to resolve your issue. [URL]
Unable to move devices from 1 SRDF group to another.   I have disabled the SRDF group and then tried moving,  I am getting below error  The requested operation cannot be performed while SRDF/A session is active.   I also tried to split the group and then move, Error : The device is not in a valid RDF state for the operation.   Please let me know what to do.        
Unable to move devices from 1 SRDF group to another.