The parameter attribute @ASKUSERIFNA is used to define that the value should be asked to the user if not available in an Object or TeLiTab.
Place @ASKUSERIFNA in the data slot of the parameter
See also the <span class='quaestor_syntax'>@PENDING</span> attribute.
Member of functional group: Modeling
Member of knowledge base type: Classic and general type, Scenario type and Taxonomy type
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