My references show DISABLE (no trailing D).

Thanks for the suggestion Tom. We tried with and without the trailing D, and it still fails to disable the UDF. Have also tried ENABLE and ENABLED FALSE.  I've combed the scripting doc and the forums, and can't seem to find anything that specifically addresses disabling a UDF in the Additional Grid under lines. I'm pretty sure it's possible, right?

In a grid, things are different.  Here are a few lines of code from a lines script I wrote a few months ago... hope it will help.

    retVal = myUIObj.SetControlProperty ("GD_LINES","Row",0)
    retVal = myUIObj.SetControlProperty ("GD_LINES","Column$","UDF_ORIGINAL_UNIT_PRICE")
    retVal = myUIObj.SetControlProperty ("GD_LINES","Backcolour$","RGB: 255 255 150")

Kevin - it definitely helps as I'm now able to affect the properties of the grid cell (which hadn't been able to do prior) but I'm still missing the syntax to disable the cell.

I did some more digging and came across https://sagecity.na.sage.com/support_communities/sage100_erp/f/sage-100-personalization-customization-and-productivity-tools/99908/ouiobj-setcontrolproperty-question Where Elliot says the control name is LOCK - but using his example I cannot get the lock to engage.

Alternative idea:

Set up customization groups and create a custom panel for each value.  Disable the column in one of the panels, then control who has the ability to make changes by the customization group assigned through User Maintenance.  (Eg. your All panel has the field as read only, but the version for MGR has the field active).

Not really a workable option for us Kevin due to the fact you can set only one customization group per user. It's further complicated by the fact that I have 11 live companies in our system (not to mention all the payroll companies and play companies). The users customization rights vary by what company they are in. So in Company A they are allowed to see it, but in B they are not. Companies A &B can have shared customizations or none between users.

Everytime we had to add a UDF, we'd have to customize a dozen or more panels - that's why we script :)

Well, then perhaps hide the column instead of locking it?

Unfortunately that won't work either in this instance, as all CSRs need to see the field, but only certain trusted reps need to be able to edit the field in non-stock item circumstances. But the alternative suggestions are certainly appreciated!

Then mirror the field (via script) and set one as read only.  Hide one by Role.