Check-out and check-in operations in scripts must occur in matching pairs.

Question

Hello there, 
 I have a Workflow State script on the invoice workflow that looks for a matching Purchase Order(PO) and updates the PO's Remaining Balance. 
 That method checks out the matching PO, updates de Remaining Balance and then checks in the updated PO. 
 
 It was working fine, but it stopped working when I replicated the code to a new Vault and VAF. I'm getting the error message " Check-out and check-in operations in scripts must occur in matching pairs." when it tries to do the CheckOut. 
 
 I'm using the COM API in VAF to do it with the following commands: 
 env.Vault.ObjectOperations.CheckOut() 
 env.Vault.ObjectOperations.CheckIn() 
 
 My questions: 
 What may cause it to stop working on the replication to a new vault? 
 Why is this error happening at check-out?

Juuso Suominen · Accepted Answer

With VAF, you rarely have to use explicit CheckOut() and CheckIn() -commands. I would suggest using ObjVerEx -helper object instead of COM API directly. ObjVerEx has for example SaveProperty() and SaveProperties() functions, which are automatically doing check out and check in if it is necessary.

The ObjVerEx class in the Vault Application Framework (m-files.com)

For the error, maybe there is some special case, where your code would skip Check In and object would stay checked out for the MFServer?

Check-out and check-in operations in scripts must occur in matching pairs.

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