VAT Entries from Journal Entries not reflected in VAT 100 Report

The VAT (and Tax reports in other Country editions) are based on the tax amounts entered on transactions, including Journal entries rather than simply by posted amounts to those accounts. If the user has valid tax amounts they need to make adjustments for they should use the VAT columns on Journal Entries (and the related VAT Account field to determine whether they are adjusting VAT on Purchases or on Sales). These will then be picked up on the VAT reports correctly.