Documents not coming in to SAP

Hi experts,

My client is using third party software Basware for processing incoming invoices. it is giving following error while transferring the document from Basware to SAP. Kindly help.

Its urgent.

Error displayed

Message = ‘Error in Document BKPFF $ PP1CLT700’ Type=’E’ Id=’RW’ Number =

Message=’Order XXXXXXXXX does not exist’ Type= ‘E’ Id=’KO’

Message = ‘Network or Network Activity XXXXXXXXX does not exist’ type= ‘E’

Message = ‘Network or Network Activity XXXXXXXXX does not exist’ type= ‘E’

Thanks in advance

JS