Mexico Exempt Tax--HELP!

Hello all:

I need help in setting up a tax code/group for our Mexico plants.  It is called VAT0 the idea of it is to show tax going on and the same tax coming off.  I can get part of it however I cannot get all of it.  The accounting should look like this:

Invoice                                          DR                                   CR

12915 VAT Deferred                   240

12110 AR                                   1500

41110 Revenue                                                                1500

23260 VAT Deferred AP                                                    240

Applied Cash

(This is where I fail)

Cash                                            1500

AR                                                                                     1500

12915 VAT Deferred                                                          240

23260 VAT Deferred  AP             240

How do I defer both of these taxes?  Ideally they want an exempt tax but they have to show the taxes as coming on and then off.  Hope this makes sense!