Anyone see a problem with the code below?

IF NOT USED('CPRIME')
	USE CALLLOG AGAIN IN 0 ALIAS CPRIME ORDER TAG CALLPRIME DESCENDING
ENDIF

Its been working for months but has suddenly decided not to co-operate and falls over with the complaint that the file is in use. I already knew that dammit! Thats why I used "again".

This would seem to suggest something has gone wrong elsewhere but I haven't a clue where to begin looking...