Hello Community,
In our app there is a process model which has two variables of type INT. By default they had no value and downstream logic expected this. In a recent change someone added the value of zero to these variables and broke the logic.
We tried deleting the value of zero in the process variables definition, saved and published but when testing still saw the error. Coming back to the PM we still saw the zeroes. We tried multiple times to delete the values and every time they would come back even after saving and publishing.
The only solution we could find was to set the value of the vars to "=null".
Is this behavior expected from Appian? (For the var values to come back even after clearing them)
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It is not expected for the variable values to return once a new published version has been pushed to production. This new version will only affect new processes kicked off, not ones that have already started. For best practice, the default values for process variables should not be used. To properly set or clear the value of a process variable, use the 'Data -> Output' tab within a Script Task node.