FCV In Bank Accounts is Incorrect comparing to Trial Balance

Hello Dears 

My COCD Currency is EGP and slope Account Currency is USD 
for Example: one person 100 USD and each Dollar for 50 EGP truthful it should beryllium 5000 EGP successful My proceedings Balance nether this Account 
It appears successful Trial Balance and FBL3N with recognition (-2500) And its Incorrect due to the fact that one person debit 100 USD 

After A period it May 1 dollar = 52 EGP truthful however tin marque System Adjust the section and Trial Balance for that relationship erstwhile I changed the Rate? noting that one tally FAGL_FCV For Gl Balances and thing Changed successful TB

Thanks In advance