Problem in Saving the entries of SD& compcode fields when Creating BP

Hi

When I am creating BP of Role  ISM020 (Media Customer)  and Grouping ZAGN , Then  genaral data is saved

But The fields in Sales and Distribution Tab , and company codes Disappear after clicking the save,

It also gives the error  *KNB1-AKONT: Plausibility check failed* Also the BP is created with the BP number, But the fields in Sales& Distribution like sales org/sales group/

and terms of payment/ Payment methods  etc is not saved.