Message type: E = Error
Message class:  VTX - Messages from tracking notification processing 
Message number: 523
Message text: Shpg notification &1: GR already posted for corres. int. notification &2
There are several internal notifications for the external shipping
notification &. For the internal notification & a complete goods receipt
has already been posted.
Tracking is no longer possible for this internal notification. The other
related internal notifications are updated in the usual way.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message VTX523 indicates that there is an issue related to shipping notifications and goods receipt (GR) postings. Specifically, it means that a goods receipt has already been posted for the corresponding internal notification, which prevents further processing of the shipping notification.
Cause: The error typically arises in the following scenarios: Duplicate Posting: A goods receipt has already been recorded for the shipping notification, and the system does not allow a second GR for the same notification. Incorrect Sequence of Operations: The shipping notification may have been processed out of the expected sequence, leading to inconsistencies in the system. Data Integrity Issues: There may be issues with the data integrity in the system, such as missing or incorrect entries in related tables.
Solution: To resolve the VTX523 error, you can take the following steps: Check Existing Goods Receipts: Use transaction codes like MB03 or MB51 to check if a goods receipt has already been posted for the
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