Tax line is getting reversed and recreated

Hi,

We have come across a situation where the existing tax line is getting reversed and is recreating with the same tax information. We have Sabrix integration with  EB Tax for taxcalculation.

Scenario.

1. Create the invoice with a tax control amount.

2. Enter the item line

3. Click on calculate will  create the tax line as per tax control amount

4 Put for validation which in turn will make Sabrix call

5 Sabrix will reverse the EB tax line and  will create Sabrix line(Line type Misc)   --  Expected

6. After this, the existing Tax line is getting discarded and is  recreated with the same Tax details -  Not expected.