NAV 2016 - Workflow problem (table locked) when send multiple approval requests at the same tiem

Dear all,

I got this problem when implementing standard Workflow template 'Sales Order Approval Workflow' to my client.

The case is that 3 or 4 users send Approval Request at the same time, then this happened:


Any one got this problems before? Please share your ideas about this.

Thanks and best regards,