Your statement implies that there is an issue with changing values in the %app hash within the print_application() function. Since you didn't show us the print_application() function nor did you show us the beginning of your script where you (correctly) have 'use strict;', I gave you the most common error which is a mispelling of %app.
Some other possibilities include:
Given the dearth of information, this is the best I can do. Good luck!
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In reply to Re^3: Changing the Value Assigned To A Hash Key
by dragonchild
in thread Changing the Value Assigned To A Hash Key
by Anonymous Monk
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