Changing Value field in COPA

Hi,

We have already posted a billing document. The material contains alternative unit of measurement. In the material master the alternative unit of measurement has been maintained wrongly. Due to this the report in copa shows a wrong picture in terms of units sold and the respective COGS for the material. Now we have changed the alternative unit of measurement.

But how to change the value in the value field. Kindly help me in this regards

Example: Material 1 Base unit : M2, Sale unit PC. Alt UOM wrongly maintained: 1 pc = 100 M2. Sold qty = 10 Pc, sold qty in Base unit : 1000 M2. Actual UOM : 10 PC = 100 M2, Actual old qty : 10 PC , 100 M2.

Regards