Hi,
the system check if each node in the hierachy is unique. That means for each leaf the system can only derive one parent node. If the systems finds zero or more than one parent node you get the error message ups1091. See transaction SE91 with message class ups1 and message number 091 for further details. You can alsp press the "where-used" button, to find out, where the error is raised.
So you need to model your hierachy against this restriction.
Regards Matthias Nutt
SAP Consulting Switzerland
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