Getting Error in MIRO

Hi Gurus,

I am Doing 3rd Party Scenarion in IDES system on 4.6C ,when i tried to MIRO based on PO,

system gives the following Error,

For Object RF_BELEG (COMPANY CODE XXXX),number Range intervals 51 does not exit.

Diagnosis.

The Database table NRIV has the delivery class "C" i--e the SAP default settings are only in client 000.

So i tried to change number ranges with T-code FBN1 .but not possiable its gives Overlap.i tried in all aspects in client 800 which i am getting error.

Is ther anything should do with Client Level in 000.

Any Suggestion from Gurus

Rgs

Rag