Deleting Users from SQL

GP2010

SQL 2008 R2

In our DEV or TEST environment, it is often necessary to pull in a fresh copy of the LIVE data.  Many times (nay, MOST times) this causes the user logins to fail.  Simple enough to just delete the user and re-add them, right?  Yes, unless you get the "Deleting the login failed for an unknown reason. Contact your SQL Server Administrator for assistance" error.  There is a work-a-round for this in KB 943027 (support.microsoft.com/.../943027) but I was still having some issues even after following those instructions.  

When executing the statement DELETE DYNAMICS..SY10000 WHERE USERID = 'User_name', I get the following message:

Msg 4405, Level 16, State 1, Line 1

View or function 'DYNAMICS..SY10000' is not updatable because the modification affects multiple base tables.

However, if I run the below, then SELECT * FROM SY10000 WHERE USERID = 'User_name', no results are displayed (which is good).

-- Ctrl+H to find and replace  the 6 occurances of the user's name

DECLARE @USER as varchar(30)

SET @USER = 'User_name'

DELETE COMPANY_1..SY01401  WHERE USERID = @USER

DELETE COMPANY_2..SY01401  WHERE USERID = @USER

DELETE COMPANY_3..SY01401  WHERE USERID = @USER

DELETE DYNAMICS..ACTIVITY WHERE USERID = @USER

DELETE DYNAMICS..SY10500  WHERE USERID = @USER

DELETE DYNAMICS..SY08000  WHERE USERID = @USER

DELETE DYNAMICS..SY60100  WHERE USERID = @USER

DELETE DYNAMICS..SY01600  WHERE USERID = @USER

DELETE DYNAMICS..SY01400  WHERE USERID = @USER

DELETE DYNAMICS..SY01403  WHERE USERID = @USER

DELETE DYNAMICS..SY60100  WHERE USERID = @USER

DELETE DYNAMICS..SY10550  WHERE USERID = @USER

USE DYNAMICS

DROP USER User_name

GO

USE COMPANY_1

DROP USER User_name

GO

USE COMPANY_2

DROP USER User_name

GO

USE COMPANY_3

DROP USER User_name

GO

/*

Only run this if you're still having an issue adding user back to GP as this will

remove the SQL login and affect this user's access to all databases on this instance.

DROP LOGIN User_name

GO

*/

I hope someone finds this helpful and please, VIP's, if you see a glaring issue with any of this, feel free to critique.