Approval workflow is failing due to null value

Summary:

DoR Approval workflow is failing due to null value

Content (please ensure you mask any confidential information):

Hi All,

We have a requirement from a client where they want to trigger different approval workflow based on the value provided in document of record's DFF. In order to incorporate this we created one numeric field and put a condition on that field, but when a user is trying to submit this document of record approval workflow is getting failed with this error-

"Ensure that a value is entered for the mandatory attribute used in the rule configuration or add a not null condition for this attribute."