Price include taxes on Project Invoice AX2012 R3

Hi everybody! I really need your help please!

I'm using the Project management and accounting module in AX2012 R3 CU8, and I have an issue with the tax calculation.

I have the following configuration:

• Accounts receivable > Common > Customers > All customers ---> Invoice and delivery fast tab, Prices include sales tax = Yes
• General ledger parameters > Sales tax > Amounts include sales tax = Yes

And when I create an invoice proposal the system does not include the tax on the prices. For example, my sales tax is 10%, if I invoice 1 hour at 100 USD, the system calculates 10 USD as sales tax, and I need to calculate 9,10 USD.

Can anybody help me?

Thaks a lot!!