InfoPath Error: Still getting “Only Positive Integers Allowed”

Question

Getting the following InfoPath error: Only Positive Integers Allowed Error:

Followed following suggestion (well, my 2nd dropdown was already like below) and made sure it's like below. But still getting above error. Please suggest.

If you get an error that says Only Positive Integers Allowed, you're trying to save a string into a column that is expecting a number. Most likely the Sub Project drop down's value is set to a string but because the column is a lookup, it needs to be a number instead. To fix this error, right click on the Sub Project dropdown and choose Dropdown list properties. Then underneath Entries, change the Value from d:Title to d:ID. After you republish the form, the form should start saving properly.

Answer 1

I have resolved the issue by fixing the "Set a field" action rule for the 1st drop down to store ID of the second drop down instead of title. Now it's all fine. I am posting the answer in the event someone else running into same issue. Thanks

Answer 2

Also make sure the lookup column in sharepoint is not set to required. I was unable to solve this issue for awhile, but I finally noticed that removing the "required" setting on the column within sharepoint will prevent the 'only positive integers allowed' from appearing on your form!