Patch file from 1.1.3 to 1.1.6 should have one update SQL file, instead of the following
UPDATE-SCRIPT_VirtueMart_1.1.3-to-VirtueMart_1.1.4.sql
UPDATE-SCRIPT_VirtueMart_1.1.4-to-VirtueMart_1.1.5.sql
UPDATE-SCRIPT_VirtueMart_1.1.5-to-VirtueMart_1.1.6.sql
Should be combined into one 'update script'
UPDATE-SCRIPT_VirtueMart_1.1.3-to-VirtueMart_1.1.6.sql