We want the manual input for the document number in session tfacp1100m00. Also for smaller numbers than the offered number.

When we entered the smaller number, system automatically change the invoice number to the offered number.

Hi,
The numbering of incoming invoices is automatically run by the system in sequence...so u can not change it manually.
The only way to change that is altering the standard source.
Regards,
Pedro

There is a field on the transaction type definition in tfgld0111m000, 'documents in fixed sequence'. You could try setting that to 'No'

Hi,
This session is not run by transaction type but by the last used number in session tfacp0100m000, therefore there is no transaction type sequence handling this.
Regards,
Pedro

Pedro is right of course. I should have checked the session quoted in the original post rather than rely on memory. Apologies.