MathCAD - Unable too assign Inputs in MathCAD while doing MathCAD Integration

[Catalina]

Hi @JG75 

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[LucMeekes]

I guess this is related to this: https://community.ptc.com/t5/Mathcad/Assigning-Inputs-amp-Outputs-in-Mathcad/m-p/1009751#M216746

Right?

Luc