Document Approvals for Purchase Quotation

I would like to use Document Approvals functionality for Purchase Orders, Sales Orders and Purchase Quotes. I have managed to setup for Purchase Orders and Sales Orders the cycle works. I am having problems with Purchase Quotes when I click Functions -> Send Approval Request, I get a message 'Quote 1003 has been automatically approved and released' yet I will be logging in as a user whom i have set a limit amount on 'Purchase Amount Approval Limit'. So my question is does this Document Approvals functionality work for Purchase Quotes? If not then why is this function present on the Purchase Quotes Document.