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CHECK_33 - Append structure field names

When adding an append structure to SAP standard tables/structures, the field names should be named ZZ or YY something.

See http://help.sap.com/saphelp_nw73/helpdata/en/cf/21eb61446011d189700000e8322d00/frameset.htm

If adding a field as described in a SAP note in non customer namespace, do not use append structures, add it to the SAP object. As the append structure will cause problems when upgrading the system.