List of Supported QIF Fields

Is there a listing available that shows which QIF codes are supported when importing statements? Specifically, I’m looking for which code to use to correctly map a field from my database to the “Account” field in Manager.io.
Either codes “L” and “S” aren’t supported, or I misunderstand their definition. I’m leaning toward the latter.

This is a sample transaction from my QIF formatted file:

D06/18/2016
PFloor mats
T-21.68
L21000 <= This is group number in my C.O.A.
S21020 <= This is an account number under that group.
^

D03/18/2016
PATM CHECK DEPOSIT
T45.0
L10000
S10030
^

When importing statements, all transactions default to the Suspense account, then the transaction is re-assigned by either a Bank Rule or Edit Function. Therefore, the transactions are imported as “incomplete - no account” and as such there is no direct mapping to an “Account” as far as one is aware