Line variance hold is applied

Line variance hold is applied when the header amount is not equal to the sum of line amounts.

Suppose you get an invoice from supplier $1000 with line $XXX and $XX.XX tax amount. When you enter this invoice in oracle there is a good chance that your line amount wld be a bit less or more than $1000 .like $1000.01 or $999.99

In this case depending upon the allowed variance system might put the invoice on hold. Simple way to remove the hold is to make the header amount same as the line amount.