error RF -BELEG

Hi

Whem i am creating stocks in t.code MIGO with movement type 501,the document is OK but unable to post it.The following error is displayed

ERROR:For object RF-BELEG AUSL ,number range interval 49 does not exist FBN1.

Note:AUSL is my company code.

I have also created number range interval.

Thanks

Regards

Hema