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ABL Reference
Handle Attributes and Methods Reference : MUST-UNDERSTAND attribute
 

MUST-UNDERSTAND attribute

Indicates whether a SOAP-header-entryref object is mandatory (TRUE) or optional (FALSE) for the recipient to process.
Data type: LOGICAL
Access: Read-only
Applies to: SOAP-header-entryref object handle
If the SOAP-header-entryref object does not contain a MUST-UNDERSTAND attribute, this attribute returns FALSE.