Interface error in a!save

Question

Not sure where i went wrong, gets below error, i understand error says i cannot use rule inputs in a!save, any suggestions to fix it:

anthonyp8915 · Accepted Answer

Is this interface a standalone interface, or is it being used as a component within a parent interface? 
 If it is a child interface, there&rsquo;s a possibility that ri!cancel is being passed a constant from the parent interface. Since constants are read-only, attempting to save a value into ri!cancel will result in an error. 
 Similarly, if this interface is being called from a process model, check whether the process is passing a constant instead of a writable process variable. Otherwise, could you provide some context of where and how this interface is used?

kishorej1999 · Answer

Hi tanujd6440 , 
 First save your result in the local variable and use save with local, e.g., a!save(local!TR_Expense_details.hrApproval, now()), and then save this to the rule input a!save(ri!TR_Expense_details.hrApproval, local!TR_Expense_details.hrApproval).

Stefan Helzle · Answer

This would not solve the problem. 
 When using the index() function for passing fields in variables to rule inputs, index() returns a copy of the data instead of a reference. Then this exact error happens.

Interface error in a!save

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