Data Services Designer - Print from within Query Mapping?

Hello,

I am using DS 4.2, and am new to SAP products in general.  I am working on a Query Mapping, which is using a function:

to_date(STG_FPDS_TCL_INCOMING.DATE_SIGNED, 'Mon DD, YYYY')

On occassion, I am seeing an error in my logs that points to an invalid month from this function:

Invalid value <Month: 13> for date <Date Signed>. Context: Column <Project Column AIColumn18>.

I tried adding IF-ELSE to print the DATE_SIGNED values from within this mapping function, but it would not validate.  Is there a way to see the value when the function throws an error?

I am guessing with the date format being used, a month of 13 indicates an out-of-bounds.

Thanks for any help.

Brendan