'Function getGlideObject is not allowed' error message on Business Rule

[matthew_hughes]

I'm wanting to the update the following field on a request based on the time a request is created:

I'm wanting to update the value via the following Business Rule:

However, when I create a new request and save it, I get the following error message and the field is not populating:

I was just wondering if somebody could explain why the error message is occurring and what I need to do prevent it from re-occurring.

I've created the Business Rule and new field under a different scope

[SHARANsnow7]

Hello @matthew_hughes 

For your reference also check below link

https://www.servicenow.com/community/developer-forum/urgent-help-function-getglideobject-is-not-allo...

Thanks,

Sharan

[Peter Bodelier]

Hi @matthew_hughes,

That is not the way you fill a field in a script.

You should use either one of below lines

current.field_name = 'new_value';
current.setValue('field_name', 'new_value');

Is this always going to be a hardcoded value? 
Then you shouldn't need to use a script at all, but just select the field and value in the Actions tab of the Business Rule.

[matthew_hughes]

I tried that as well, but the same error was occurring.

[Peter Bodelier]

I doubt it is coming from the Business Rule.

If you remove the read only of the field, and set the value manually, does it still happen?