Excel Source Trying To Import Additional Columns

Hi

I have an excel source which is a 41 column sheet. The excel filepath is stored in a table and captured into a variable. The excel source import is contained within a foreach loop and will loop through each file and continue until all the excel files are processed. It works fine until it gets to the last file. The import then fails with the following error:

The column "F42" needs to be added to the external metadata column collection.
The column "F43" needs to be added to the external metadata column collection.
The column "F44" needs to be added to the external metadata column collection.
The column "F45" needs to be added to the external metadata column collection.
The column "F46" needs to be added to the external metadata column collection.
The column "F47" needs to be added to the external metadata column collection.

Now when i open the excel sheet and hit CTRL+END the cursor goes to a column 6 to the right of the last column with data in it, effectively column 47 where column 41 is the end of my data.

I guess that the jet engine is trying to import these additional columns but because i am not expecting them there is no destination set up for them in the OLEDB destination and susequently the metadata needs to be added. I do not want to do this as these are excel files originating from the client and i cannot control how many additional columns they are going to "add".

Does anyone have any ideas as to how i can solve this? Is there a way of identifying the last column with data and only importing those columns?

Thanks in advance for any help or experience of this issue