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Hello Marcin,

 

The parameter has an attribute

UserParameters.item(1).attributeSets.item("com.autodesk.inventor.parameterAttributes").item("AllowCustomValue").value = 0/1

this should help you, I hope

If this answers your question then please select "Accept as Solution"
Kudo's are also appreciated Smiley Wink

Succes on your project, and have a nice day

Herm Jan