Chile Country - Pre numbered forms

Hi

we are having a issue while runnng IDCP to assign the prenumbered form number to the billing doc.

We have created classes for the document types and assigned them to the document types.

in the assigment of these classes "A-Invoice to document type RV" - we have made the following seetings

Official document Number- Number assignment using Prenumbered forms and checked the indicator for self issued document number

we have created a lot and also a book.

While running the IDCP for the sales org its throwing the error mesage "formatt of official lot number XXX is not valid"

any idea on this?

did anyone encounter anything like this?

Thanks for your help

SAP245