Source field 'Proprietary Reference' not working in the parse rule

Summary:

We are trying to import a CAM53 statement using the Process Electronic Bank Statements job. We have created parse rule to move data from the proprietary reference into the additional entry information field, and it is not working, Has anyone used this before?

Content (please ensure you mask any confidential information):

The rule works for another source field (Check Number) but not for this one. I can see the data in this field on the bank statement. There is no error when saving the parse rule also. Here is the rule we are using.

Version (include the version you are using, if applicable):