BRFplus: XML Export Fails for boolean expression

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Symptom
XMl Export fails for boolean expression with error message:
1. No Operand Set
2. Condition of Node &1 does not have a boolean result.
where &1 is replaced with the node number.
Other terms
BRFplus, FDT, XML Import, BOOLEAN, XML
Reason and Prerequisites
If the boolean expression was modelled with operation of ALL OR or ALL AND, then the operands were not [...]

Transport for application defined expression types

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Symptom
The transport of expressions for expression types defined within an application different from the BRFplus standard application did not work properly, if these expression types used their own database tables and SOBJ transport objects.
Reason and Prerequisites
Error
Solution
Program correction