I ran TMSXTEND with PARM='TEST' and noticed, that during the test run data was copied from the active TMC to TMC.N. Can TMC.N be reused for the run without TEST or is it required to allocate a new empty TMC.N?
No need to allocate a new empty TMC.N data set after it has been used by TMSXTEND with PARM='TEST'. It does not matter if TMC.N contains data from a previous TEST run or not.