...

dw_1.dataobject=d_prdtorder_view_cust

...

if ls_refno<>"" then
 dw_1.dataobject="d_prdtorder_saleno"
 dw_1.settransobject(sqlca)
 dw_1.retrieve(ls_refno)
else
 dw_1.retrieve(ll_cid)
end if

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