Diagnosis
You can not enter a tax amount in this item since, due to the postingamount entered and the tax code, a total tax amount of zero has beencalculated.
This could either be due to the fact that the tax code has been definedwith a value of 0%, or because the posting amount entered (that is, thetax base) is too small.
Example:
With a tax rate of 15%, a tax amount greater than zero will only beachieved with a base amount greater than 0.04. With values of 0.03 andless, it is therefore not possible to enter a tax amount.

Procedure
Only enter tax amounts in conjunction with tax codes for which apercentage rate not equal to zero has been defined. Make sure that indocuments with several G/L account items you enter the total tax amountin an item with a sufficiently high posting amount.