"Calculate Tax" field in advance payment method

Can we use the 'cal. tax' field while making advance

payment wrt to any line item of any purch. order

If we cannot use then what is the use of this field while making the advance payment

We want that while making the advance payment, the entry for tax should also be passed. but when we are trying to do this by filling '-' in tax category in alt recon gl. and then ticking 'cal tax' in f-48 we are getting a error message.

Finally can we use this cal tax field while making advance pmnt against any p.o line item or not?