I have a problem running an analysis. At times, the calculation input tag becomes questionable. Therefore, the analysis is not performed. Would there be any way to differentiate questionable from bad and make the analysis run? Thanks!

Hi. You'll have to combine your BadVal() check with a check for questionable values.

Use the IsSet('Attribute', "q") function in combination with BadVal() to bypass the problem.

PS! If you use PI AF SDK, the equivalent to BadVal() is the IsGood() property on the AFValue object. This, however, considers questionable values as good.