The format of the execute form of TESTCB is:
[label]
TESTCB
[{ACB|EXLST|RPL}=address] [,ERET=address] keyword={address|name|abs expression|option},... ,MF=(E,address) [,OBJECT={DATA|INDEX}]
Rule: If the execute form of TESTCB is used and EXLST is used as a keyword to be processed, the block must be identified by ACB=.