R47131 not updating UPRC field correctly incase of Change record .

Hi Experts

Can someone help

1)I enter a new SO through R47011(tables F47011 and F47012) and when I run the report a new SO is created in F4211
e.g
DOCO LNID UOM UORG UPRC
100 1 HR 2 775

2)Next i want to make some change in the above SO line and data entered in F47131 and F47132 as below and report R47131 runs .It updates the data in F4211 but incorrectly(UPRC not correct).

data in F47131 as below:-
DOCO LNID UOM UORG UPRC
100 1 DY 3 2000...

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