* this is the product UPC code
    TEMPUPC=CNTTEMP
    Locate For TEMPLOC=INVCOUNT.CLOCATION;
           While TEMPUPC = INVCOUNT.CUPC 
** I think here is the problem
** What If TEMPUPC is not equal to INVCOUNT.CUPC 
** because just beforre LOCATE You set TEMPUPC=CNTTEMP, but is the CNTTEMP == INVCOUNT.CUPC ?