Cannot compare incompatible operands of type Null and type Number(Integer)

Question

Hello, 
 I'm getting this weird whenever I pass in the rv!identifier of a record

Here is my related record action below. I'm only passing in the rv!identified which should be stored in the corresponding rule input ri!projectPlanId

When I pass a test (i.e projectPlanId = 82) the interface works like I want it to. But when t is passed through the related record action, and test it through the site, the error persists.

is there a typo I missed or am I missing something more complicated here. Isn't the interface supposed to take in the rv!identifier, which I know is a number. Or am I messing up somewhere else? If anyone likes to see snippets of code, I'd be happy to provide some. 
 
 Appreciate all the help!

Mike Schmitt · Accepted Answer

Tamara Saadeh said: is there a way to make the projectId coming in from the latest project null 
 generally speaking, what you'd do is, before the DB write, set just the primary key ID field to NULL, and a new row will be created (with a new ID), along with the data from the other populated fields of your data.

Mike Schmitt · Answer

Can you screenshot the configuration of your start form from within the process model? I'm concerned that your form isn't actually getting any value passed to the IDs correctly (also i'm slightly unclear whether your form requires ri!projectId, ri!projectPlanId, or both, etc.) 
 What happens when you test your interface with NULL supplied to both of those rule inputs? Does it show the same/similar error message?

Cannot compare incompatible operands of type Null and type Number(Integer)

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