Question : Change user from one Notes Organisation to Another

Our company has been merged with another and both have a new name. I have registered a new organisation and also organisation units.  
Cross certified the old and new Cert ID's both ways.
I need to gain confidence that when the time comes I can move all my users without problems.
Created some test users under the old heirarchy and moving them by
Rename/Request move to new certifier, select original OU ID then select new OU.
Process AdminP. Creates the Name Move Request in AdminP db
Complete move, selecting the new OU ID.
Process AdminP.
AdminP shows that the Move has happened without error but the Initiate Rename in Domino Directory fails with this error
File name: names.nsf; Error: The signature on the certificate was found to be invalid.  Check the log file for details.

Help please.

Answer : Change user from one Notes Organisation to Another

Seems that the problem is with my ID file. I have reverted to an old copy of the ID and now this works fine.