Relating ZX_LINES with AP_INVOICE_DISTRIBUTIONS_ALL and PO_DISTRIBUTIONS_ALL this query shows HOWTO
zl.ZX_LINES relation with al.AP_INVOICE_LINES_ALL
zl.trx_id = al.invoice_id
zl.trx_line_id = al.line_number
zl.entity_code =’AP_INVOICES’
zd.ZX_REC_NREC_DIST relation with ad.AP_INVOICE_DISTRIBUTIONS_ALL and relation with zl.ZX_LINES
zl.trx_line_id zd.trx_line_id
zl.tax_line_id = zd.tax_line_id --(PK ZX_LINES)
zd.entity_code = ‘AP_INVOICES’
zd.trx_line_dist_id = ad.invoice_distribution_id
With PO
zl.ZX_LINES relation with pl.PO_LINE_LOCATIONS_ALL
zl.trx_id = pl.po_header_id