Field overflow warning while increasing the quantity field to its max

  We are getting a warning in SRM portal, when we tried to edit the PO by increasing its quantity to 10 digits.

  like, we given the quantity field value as 1111111111, then it is showing warnings as :

"Field overflow  while calculating the condition 01CG "

  and

"Field overflow  while calculating the condition 01PB".

  please help us,, it is little urgent..