A customer flagged this issue since v28.2 environment, and it’s worth knowing about if you use “Prices Incl. VAT” on purchase orders or purchase invoices.
The problem
When “Prices Incl. VAT” is set to true, BC has always kept the “Direct Unit Cost” for G/L Account lines when you change the VAT Product Posting Group. The total including VAT stays the same.
Old Behaviour
Here’s an example. Start with a G/L Account purchase line, VAT Prod. Posting Group set to VAT15:
- Total Incl. VAT: 100
- VAT Amount: 13.04
- Total Excl. VAT: 86.96
Now change the VAT Prod. Posting Group to NO VAT. This used to give:
- Total Incl. VAT: 100
- VAT Amount: 0
- Total Excl. VAT: 100
That’s the behaviour you’d expect. The total does not move.
New Behaviour
But from the affected build, the same change now gives:
- Total Incl. VAT: 86.96
- VAT Amount: 0
- Total Excl. VAT: 86.96
Root cause
According to the repo, this started with build w1-28.2.50931.51034. BC changed the condition for when it recalculates the direct unit cost to include G/L Account lines:
Before this, G/L Account lines were not part of that unit cost update logic in the same way. Now that they are included, the behaviour that used to hold for these lines breaks.
Why the changes? No idea. If you’re on v28.2 and you use “Prices Incl. VAT” with G/L Account purchase lines, it’s worth to be cautious about this, especially if VAT product posting groups get changed after the line is entered.
Sales Line logic remains the same.
