Вот так:
X++:
while select inventJournalTable
join inventDim
where inventDim.inventDimId == inventJournalTable.InventDimID &&
inventdim.InventLocationId =='А'
join inventdim1
where inventdim1.inventDimId == inventJournalTable.ToInventDimID &&
inventdim1.InventLocationId =='Б'