PHP Can't Update Picklist with Existing Value

Question

I'm having a very strange problem with PHP (Laravel with Forrest) and updating values.

I've got a pick list called Approved_Rejected__c with the following values:

• New
• Submitted
• Approved
• Rejected

And am using the following call to update said picklist:

'Approved_Rejected__c'  => 'Approved',

Weirdly that doesn't work and only provides a

Salesforce Response Error

However, when I try the following:

'Approved_Rejected__c'  => 'Something Random',

It works and:

 'Approved_Rejected__c'  => '\'Approved\'', Works

Works, albeit with apostrophies around the word Approved.

It seems like the picklist is only accepting values that don't exist within the Picklist, but if I try a value that does exist there's a generic and unhelpful error.

I feel like I'm missing something simple but can't quite figure out where or why.

Edit I've tested the exact same thing against a different Picklist field and it worked, leading me to think it's something to do with the Picklist field itself.

It's not set to:

Strictly enforce picklist values

And Field Level Security is set to Visible, but not Read only so that all looks good.

Answer 1

I've found the problem. I tried updating the field to "Rejected" and it worked, so then within Salesforce I tried to update it to "Approved" and got a long error regarding a Trigger. Looks like that's been the main problem all along.