Address and site creation results to Invalid pay_group error

Hi all,    We are trying to create a new site for each primary vendor,problem is we cannot create a new site with this error prompted

"Address and Site Creation - Unable to create address and sites because of the following error when trying to create the site in operating unit [-----]: [ PAY_GROUP_LOOKUP_CODE is invalid Pay Group is invalid]. Either resolve this issue and try again or deselect the operating unit with the error and continue. Note: any new address requires at least one site in order to be created."


prior to this addition of new site is we had updated the pay group for this vendors..when i checked from the back-end,found out that the pay_group of the sites under the vendor i had updated were also updated.