Can't change the symbol parameter value

I have pile foundation family with image parameter (Paalsymbool)
I created with a lot of help from you all a Dynamo Graph to retrieve the correct name but the value from (Paalsymbool) won’t change if i take for example (Comments) it changes correctly.

Is there a way to correctly change parameter (Paalsymbool) ??

thanks Edwin.

got it solved

The value of an imageparameter can only changed with ImageType in the Element Types node


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