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PROPERTY ValidBillTypes$ ! if null,  all are valid      | 
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PROPERTY RequireItemOnFile     | 
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FUNCTION LOCAL ClassValidateBillNo(col$, val$)    | 
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FUNCTION LOCAL ClassValidateRevision(col$, val$)    | 
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FUNCTION LOCAL PERFORM SetValidBillTypesMessage()    | 
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 itmREGULAR$, itmSPECIAL$, itmCHARGE$, itmCOMMENT$, itmMISC$, valSTANDARD$, valAVERAGE$, valFIFO$, valLIFO$, valLOT$, valSERIAL$, typFINISHEDGOODS$, typRAWMATERIALS$, typDISCONTINUED$, typKIT$, proMAKE$, proBUY$, proSUBCONTRACT$  | 
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 GetCalendarEndingDate(), GetDefaultExtendedDescriptionKey$()  | 
 
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