Custom OR Automatic TAB ORDER ?

Hi,

I am new to LC Designer. I am developing an multipage PDF form. It's having both static & dynamic fields (conditional). Count of fields is around 100. I was going through the TAB Order, and I found there are two types of TAB ORDERING available i.e. Automatic & Custom. I don't know what to opt from these available options.

My Ques: Which TAB ORDER should be used @ which time?

pls answer.

Thanks.

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Abhinav