Review the processor and if the processor is allocating and cataloging a file like this:
//INIT1 EXEC PGM=BC1PDSIN,MAXRC=0
//C1INIT01 DD DSN=&LINKCTL,DISP=(NEW,CATLG),
// UNIT=&WRKUNIT,SPACE=(TRK,(2,2),RLSE),
// DCB=(RECFM=FB,LRECL=80,BLKSIZE=3200,DSORG=PS)
Add a step to the processor to first delete the file before allocating it.