jg_zz_vat_trx_gt load from JG_IT_TAX_REPORTING_PKG

Summary:

for extend a standard report in saas I need to know how load semantically the fields of the temporary table

Content (required):

I would like to know how that package that don't want to give me the code for (when it is possible to see it if I had fusion installed on prem) loads the data on the temporary table: jg_zz_vat_trx_gt and semantically understand the fields of the table. 

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):