Filter EDT on Field Table LedgerJournalTrans

Hi All,

I am using Axapta 2009, I have one question

First I am create New EDT, name is SPFVendBankAccount with related field VendBankAccount Table Field AccountId

Second, I'm create New Field SPFVendBankAccount in table LedgerJournalTrans with type String and EDT is SPFVendBankAccount (that I Create on First Step)

And Now, I want like this :

If field AccountType in LedgerJournalTrans is Vendor and AccountNum in LedgerJournalTrans not null, Field SPFVendBankAccount on LedgerJournalTrans have contain Record in table VendBankAccount which have AccountNum = LedgerJournalTrans.AccountNum

Any someone help me ???