convert Qty from a Unit to another Unit

Ax 2012

Qty salesQty;

salesQty = UnitOfMeasureConverter::convert(
_QtyBatch,
UnitOfMeasure::unitOfMeasureIdBySymbol(_itemUnit),
UnitOfMeasure::unitOfMeasureIdBySymbol(_salesUnit),
NoYes::Yes,
InventTable::itemProduct(_itemId));

return salesQty;

Ax 2009

Unitconvert::qty();