Hello again Dermod

I'm not sure about the multi-line issue without taking a look, so other than the info found in that ticket - there's not much I can do without admin-level access.

I took a look at your table, and it looks like the "Codes" column is saved as VARCHAR(4) in the database. I've tested it, and it accepts anything as long as it's 4 characters long. As soon as you exceed 4 characters, it doesn't accept changes.

So, you need to take a look at this column's settings in the database, and check what the character limit is.

For multi-line, please provide me a temporary WP-admin login for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course we do not provide login data to third party. 

Just a reminder, since the ticket is public - please make sure to enable the private response, like you already did before.

Hi again Dermod

You're welcome, glad I could help.

When you're writing your own queries, please keep this in mind:

You don't need the table name in the query, so items_item is too much.

Also, from version 2.3 we've implemented a feature that you can use multiple separate DB connections for MySQL, MSSQL and PostgreSQL. For MySQL engine we are dynamically adding the accent grave ( ` ), so there's no need to use it around the table name in the query. If you were to delete them, searching and filtering should work just fine.

If it doesn't work, then you may need to create a view in the database, and to pull that view in.