Line Variance Hold for 1p

Invoice is created via open interface.

Invoice amount : 612.71

Line 1 amount : 466.42   standard 20% tax

Line 2 amount : 53.00     exempt 0% tax

Automatically calculated tax amount : 93.28

Total is calculated as 612.70 instead of  612.71 with 1p variance.

While validating invoice, it is going on line variance hold. I have been told that tolerance been set to 5p. How can I check the correct tolerance is setup and invoice will ignore the variance of 5p please?

Any guidance please?

Thank you

sheebs