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XE7 and more With weirdness

XE7 and more With weirdness 100% reproducable fail: Access violation at address 00B5464D in module 'MyApp.exe'. Read of address 00000040. Fails:     tpLot := Tp.Add;     with tpLot do     begin       LotId := Lot.Id; //       LotNo := Lot.LotNumber;       ExpiryDate := Lot.ExpireDate;       ProducedDate := Lot.ProducedStartTime;       ArticleId := ArtSum.ArticleId;       ArticleNo := ArtSum.ArticleNumber;       OriginalArticleId := ArtSum.ArticleId;       Quantity := NumDPacks * ArtSum.BaseUnitsPerKPack;       NetWeight := Quantity * ArtSum.NetWeightPrBaseUnit;       GrossWeight := NetWeight +         (ArtSum.TaraWeightPrFPack * Quantity);       LotLockState := Lot.LockStateCode;     end; Works:     tpLot := Tp.Add;     tpLot.LotId := Lot.Id;     tpLot.LotNo := Lot.LotNumber;     tpLot.ExpiryDate := Lot.ExpireDate;     tpLot.ProducedDate := Lot.ProducedStartTime;     tpLot.ArticleId := ArtSum.ArticleId;     tpLot.ArticleNo := ArtSum.ArticleNumber;     tpLot.OriginalArticleId :...