10000770 
Message
No Goods Receipt/Delivery has been posted. Continue?
Diagnosis
You have created a sales or purchasing document that influences both accounting and inventory (such as an A/R invoice), without referencing any base document (such as a delivery or goods receipt PO), and then chosen Add.
Procedure
Check whether a delivery or a goods receipt PO was created for the business partner and the items included in your document. If such a document exists, create the sales or purchasing document based on the delivery or goods receipt PO.
Caution
If a delivery or goods receipt PO already exists, confirming the message and adding the document results in an extra inventory transaction that does not reflect the actual status of the inventory.
End of the caution.