change in a column header in an excel spreadsheet data source

Hello all, I have a report with some excel spreadsheets as data source. 

In one of these, a column header is changed, so before was:

column header 1, column heade 2....     and after:

column header A, column header 2.....

the data carried into the column is the same, just the header changed. What is the best way to solve expression.error the column 'column header 1' of the table wasn't found. ?

Thank you in advance