Hi Abanach,
Perhaps you've found a solution by now.
If not, I can offer the following:
1) The first step is to add a GST code to be used for this in the "GST Posting Setup"
This is to add a code that recovers 100%/all customs GST.
The relevant code in the list below is the one called "FULLGST"
a) Make the GST % "100"
b) Please ensure that the "GST Calculation Type" is set as "Normal GST"
2) Next try using the code in a supplier invoice to the NZ Customs service
a) Input the lines that include fees an levies with the standard NZ GST codes against those lines
b) Input a GL expense code for the "GST ON IMPORTS" with the "FULL GST" code as set up above
c) Input a negative value of the "GST ON IMPORTS" but select your GST code that does not calculate any GST ("GSTFREE" in the code in the example below)
This results in the GST being calculated on the levies and the customs GST (called "GST ON IMPORTS" on the customs statement) being posted to the GST account for recovery.
Kind regards,
David