XLA_DISTRIBUTION_LINKS specific columns

 Hello All,

  First part :

  

   I have explored the table XLA_DISTRIBUTION_LINKS in ap schema

   but i have found some ambiguous columns i don't know from where data is inserted into it

   What are the peers of those columns in other tables ?

  for example :

  

  What is the peer of these columns

  

  SOURCE_DISTRIBUTION_ID_NUM_1 

   APPLIED_TO_SOURCE_ID_NUM_1

   APPLIED_TO_DIST_ID_NUM_1

   ALLOC_TO_SOURCE_ID_NUM_1 

  

 Second part :

 I want to link the XLA_DISTRIBUTION_LINKS with AP_INVOICES_ALL 

 how to do this please what is the common columns ?

Thanks