https://userapps.support.sap.com/sap/support/knowledge/en/3748510
3748510 - AES 3.0 Incompletion error when number of packages per item exceeds 99 | SAP Knowledge...
For AES 3.0 customs declaration, an incompletion error for number of packages exceeding 99 is displayed: "Package Details can be specified a maximum of 99...