customer transaction tab

Ok i finally found out what the transaction tab in the admin customer is for but dont seem to get it to work. From what i have read in different posts in the forum the transaction tab is used for entering credit information to a customer. I have tried to enter a description and amount and everything saved ok and shows up in the front end customer account transactions. However when i create a order for the customer account it does not deduct the amount from the order total. Am i still missing something somewhere on the setup of the transaction or is there a problem with my shop (ver 1.5.1.3)
anyone else have the same problem ?

Did you enable store credit in the order totals?

Thanks for the reply, i had not enabled this but now i have and will give it another try. One last thing is there a way of deleting entries in the customer transactions if a fault was made when entering or for simply deleting a credit if it is no longer valid

Unfortunately, not. This really should be added. The only way to delete one once added is to go directly into the database.

Tested the store credit (transaction tab setting) and it is applied to the shopping cart but for some reason it applies it twice anybody help me with this. For testing purposes i only added one entry to one customer for testing and then used the customer to place a test order where i see the credit is being applied twice.