What is the correct link between SLA tables?

Hello,

I am working on a report where I have to extract information from GL tables and projects. I am using following joins:

pa_expenditure_items_all pei

xla_distribution_links xdl

xla_ae_lines xal

xla_ae_headers xah

xla_transaction_entities_upg

where xah.ae_header_id = xal.ae_header_id

and xdl.ae_line_num = xal.ae_line_num

and xdl.ae_header_id = xah.ae_header_id

and xdl.source_distribution_id_num_1 = pei.expenditure_item_id

and upg.entity_code='EXPENDITURES'

and xah.entity_id = upg.entity_id

The query is not fetching me results because there is mismatch between xdl.ae_line_num = xal.ae_line_num