Problem in modifying Material master data using MM02

Hi,

I am using IDES ECC 6.0.

I am trying to modify the material description, Purchase order text for the existing materials 100-100 & 100-200 through client 800.

But after modifying the data, when I save the record system displaying the error "ERROR IN INPUT".

I am unable to save the data.

Please help me in understanding the reason and fix for the problem.

Thank you.