Hi Shyam,
Yes, I am aware of it. the program names suggests that too. 
However, what i intended to say is that there is no rounding off code into this segment, and probably your code is using the standard conversion logic for this.
Your code is probably converting this long decimal to 2 decimal currency using the standard conversions of SAP, hence it rounds off instead of truncating.
Your ABAPer needs to add few modifications in the manner you use the value returned by the module.
He/She needs to simply truncate the value rather than trying to convert it to 2 decimal currency.(this code will be exculsively to match the idoc value to PO value)
Regards
Vivek Singh
