LB, Yes, it is troublesome to not be able to tell which input is which inside the Programmable filter. Something I have done in the past is differentiate them inside the filter. I have tested for element type to tell them apart, for example. Something else I have heard of but have not had to use is assigning a unique variable to one input and then testing for that inside the filter to determine which input is which.
None of this may address your general problem, but here's hoping. Dennis
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