compile subroutine order_srl_fields_valid(ConvType, DataIo, Branch, ReturnedValue)
begin condition
pre:
post:
end condition
declare function msg, get_property, set_property
declare subroutine extract_si_keys

$insert logical
$insert quote_srl_equ
$insert msg_equates

equ valid$         to 0    ;* successful
equ invalid_msg$   to 1    ;* bad data       -   print error message window
equ invalid_conv$  to 2    ;* bad conversion -          "         "
equ invalid_nomsg$ to 3    ;* bad but do not print the error message window
equ CrLf$          to char(13):char(10)

ReturnedValue = DataIo       
status() = Valid$
* WO, PO
begin case
    case Branch = 'WO'
        TextOut = 'Work Order number '
    case Branch = 'PO'
        TextOut = 'Purchase Order number '
end case
begin case
   case ConvType = 'ICONV'
      if Branch = 'PO' and DataIo = 'PROCUREMENT CARD' then
          ReturnedValue = DataIo
      end else
	      extract_si_keys( 'ORDER_SRL', Branch, DataIo, Keys )
	      OrderNo = get_property( @window:'.ORDER_NO', 'TEXT' )
	      locate OrderNo in Keys using @vm setting Fpos then
	          keys = delete( Keys, 1, Fpos, 0 )
	      end
	      if Keys then
	          swap @vm with ', ' in Keys
	          MsgInfo = ''
	          MsgInfo<mtext$> = TextOut:' ':Quote(DataIo):' has been used in order_srl number ':CrLf$:Keys
	          MsgInfo<micon$> = 'H'
	          Void = msg( '', MsgInfo )
	          status() = invalid_nomsg$
	      end
	  end
   case ConvType = 'OCONV'
      * no output
      ReturnedValue = DataIo
   case otherwise$
      ReturnedValue = ''
      status() = invalid_conv$
end case
return