Using field Tax Amount (WMWST) manually in invoice

[pankaj_adhikari]

Hi All

How can we use field Tax Amount (WMWST) manually in invoice? For Example-My tax amount is 10 USD for 100 USD amount & I don't want to maintain that as percentage in tax code. I want to enter tax amount manually & it automatically takes G/L from tax code & overwrites tax amount calculating automatically. I have tried below-

a) 'Check Id' is not activated so no error is coming.

b) Condition type has Manual Entry enabled.

Whenever I try adding tax amount manually it is overwritten with tax percentage.

Pls advice.

Regards

Pankaj