F4211.SDSO09(Price History) field incorrectly updated

Hello There

1) There are sales order created from R42770 - Generate Rebate claims.

2) When the order is created it has adjustment schedule populated but there is no price history. For these orders SDSO09 is blank initially.

3) Due to one or other reasons (like changing amount) user enquire the order from P4210 and save the record. Till couple of months back SDSO09 used to be populated as 8 and sales order won't have any price history. R42800 would update the sales order successfully.

here comes details of the issue.

4) form last couple of months orders are getting stuck at 620 and it was found that these orders are amended from same version of P4210, it is now populating F4211.SDS09 as (1 or 2) and populates the price history.