! Set up your IOL into a string

LET apCheckDtlDst$="wrk.InvoiceNo$,wrk.InvoiceDate$,wrk.Comment$,wrk.PaymentAmt,wrk.DiscountAmt,wrk.CheckEntryNo$,wrk.LineKey$"

! Then you will read from $$ into that IOL

READ DATA FROM $$ TO IOL=apCheckDtlDst$