Understanding Fields on SF Tables

Hello,

I would like to obtain an understanding of what the fields below represent, their use or non-use, and what the dates represent.

PS_ACCOUNT_SF (Table)

account_nbr

account_type_sf

open_dt

close_dt

last_aging_dt

last_acct_dt_aged

PS_ITEM_LINE_SF (Table)

posted_date

due_dt

fee_cd 

 

I reviewed the doc below but did not see the information I was looking for.

Understanding Student Financials Table Relationships and Processes (Doc ID 761629.1)

 Thank you,

Andrea