Here’s a shortcut I use all the time to get to the previous field while working in a form in QuickBooks:
SHIFT + TAB
This shortcut came in particularly handy this week when I ran into a bug in the Canadian version of QuickBooks Pro 2013. Every now and again, one needs to override the GST amount. For some strange reason, I couldn’t click into the GST (ITC) field on cheques and bills. I tried everything I knew to fix this! Tab, click, open, close, relaunch the program, restart the computer, reinstall the software, recreate GST item and sales tax code, scream at the screen…absolutely nothing worked! No matter what I did, I could not override the GST! I was almost desperate enough to call technical support. But alas…I came up with a workaround! I parked my cursor at the top of the form (for example, in the BANK ACCOUNT field in a cheque) and used the SHIFT + TAB shortcut to move backwards until I successfully arrived in the GST field. I was then able to modify the amount of the GST. Right after that, I sent a bug report! There seems to be no rhyme or reason to when this happens, and I haven’t heard of anyone else having this problem, but some weird things have been popping up in 2013…
In any case, it’s a great feature. TAB and SHIFT + TAB your way around a form and see how it functions!
thinkQuickBooks 
I was wondering if I was the only one this happens to! Thanks for the work-around, Marnie š
A kindred spirit! I’m glad you were able to find my post. This only happens to me in one client’s file, and it’s very perplexing. Have a great day, Beth!
Thank you Marnie! I have found this bug in two QuickBooks 2013 programs so far, and one was in front of a classroom of QuickBooks students I was trying to teach! You saved me! š
Happy to hear it, Kathy! I’m glad you found my post. š
I guess they have not found a solution for this bug yet. I have 2014 and it started doing it to me today! Very frustrating!