Update Receivables PO

Hi if we want to update the PO for an invoice (provided it originated in SOP and is open in Receivables) is it OK to run the 2 update scripts below? Am I missing anything?

update RM20101 set CSPORNBR = 'xxx'
where CUSTNMBR = 'xxx'  and DOCNUMBR = 'xxx' and RMDTYPAL = 1

update SOP30200 set CSTPONBR  = 'xxx'
where CUSTNMBR = 'xxx'  and SOPNUMBE = 'xxx' and SOPTYPE = 3