Text list has too many characters

We have an application written in 4.6, which has been designed to hold values in text lists. These values are postal codes. The business has changed the way it behaves and has added virtually all the postal codes in the country into one of these fields. We now have errors when trying to save the documents due to the amount of characters in the field. Apart from re-assembling the functionality, is there a workaround?
It's not clear to me whether the document that contains the long list of postal codes is a regular data document, or a reference document that contains the valid values for a keyword field, accessed via @DBLookup.

Download this free guide

Download: IT Certifications 101

Inside this exclusive essential guide, our independent experts break down which IT certifications are worth your time and effort, and how to get started obtaining them to further your career— including specific certifications that any cloud or desktop pro should seriously consider.

Start Download

• Corporate E-mail Address:

  You forgot to provide an Email Address.

  This email address doesn’t appear to be valid.

  This email address is already registered. Please login.

  You have exceeded the maximum character limit.

  Please provide a Corporate E-mail Address.

By submitting my Email address I confirm that I have read and accepted the Terms of Use and Declaration of Consent.

By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.

You also agree that your personal information may be transferred and processed in the United States, and that you have read and agree to the Terms of Use and the Privacy Policy.

If the document is a data document, there's not a lot you can do, apart from changing the multi-value text field to a Rich Text field. That will hold all the data you want, but the values will not be available in views and agents. Breaking the field up into multiple multi-value text fields will probably not do any good, because the limit of summary data applies to the document as a whole, not just to each field.

If the document is a reference document, you can break it into two or more documents, each containing a subset of the postal codes and the lookup will still work, provided you don't exceed the limit of 64,000 bytes returned by @DBLookup or @DBColumn.