When you step into the code, stop before the If... statement and copy (select and <Ctrl><C>) the statement
multiple = "Declining values exist and are not explained"
Open the Immediate window using <Ctrl><G> and paste the statement in there. Make sure your cursor is on the line with the text you just pasted, and hit Return. You have now initialized the variable multiple so the If statement will catch it. You can then close the Immediate window by Xing out of it, and continue stepping through the code.