SAP MM IV Section B Posting Invoice with invoice verification in Background 

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Yes, you can post invoices without GR if you have not checked GR-based invoice verification check box in the delivery tab page in item details.

@@expertcoachinginsapmmwmsrm1593sir can you send your email id

@@mohdidreez2089 expert.coaching.sap@gmail.com

Invoicing party can be vendor in the PO or any other vendor whose partner role is invoicing party which you need to maintain in the vendor master record of main vendor.