Troubleshoot steps: 

1.  Check Item Classification.
1. In Zoho Books > items > search for the item used in the document> select the item> edit, check if the item classification field is filled in or not.
   
   
   
   
2. Check Measurement units 
   
   
1. Check measurement units line up with LHDN mandated list : https://sdk.myinvois.hasil.gov.my/codes/unit-types/
   
   
2. Type in any new units needed into the dropdown if the needed one is not available. 
   
   
   
   
3. Check tax details.
   
   
1. In the item page ,check the Tax type and the Tax for items is correct and filled in.
   
   
   
   
4. Check the details of the item and tax in the document (on the document edit page ).
   
   
5. Ensure that the updated item classification and tax details are reflected correctly.