Duplicate transaction from importing transactions

Hi,

Simple problem, when importing bank statements for the prior period 9 transaction that where on the cusp of the period had been identifed as "electronic transaction".

Importing statement from this period will of course result in duplicates for all 9 of the "electronic transactions".

I'm not going to delete last periods imported statements and reimport them just to satisfiy the 9 "electron transactions" 

There must be another way?

Cheers,

Jake