Set <arg1> <operator> <arg2>
A data element relation is defined as completely new with Set. All potentially already existing relations to <arg1> are deleted and the specified relation <arg1> <operator> <arg2> is saved as a new relation:

The processing of the expression Set takes place in three steps:
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If there are any: ALL relations to <arg1> that have so far been saved internally are deleted
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The new relation <arg1><operator><arg2> is saved in the internal list of all data element relations
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The processing is evaluated as "successful"