data in transaction statement

Hi,

OFX standard defines three dates in a statement

DTAVAIL - Date funds are available,
DTPOSTED - Date transaction was posted to account
DTUSER - Date user initiated transaction

My bank provides a statements with the following dates:

Ordered Date -- date on which transaction had to be executed (could be 
Sunday)
Execution Date -- date on which transaction was executed

My questions:
1. Which date relates to which ?
2. Which date is imported by GnuCash and shown in list of transaction
    for particular account ?
3. Should a statement from my bank contain date of booking a transaction ?

TIA,

Maciej



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