I'm not from lansweeper but I was able to get this working on my box so try this code and see if that works for you.
Select Top 1000000 tblAssetCustom.AssetID,
tblAssets.AssetUnique,
tsysIPLocations.IPLocation,
tsysOS.OSname,
tblAssetCustom.Model,
tblAssetCustom.Serialnumber,
tsysOS.Image As icon,
tblAssetCustom.PurchaseDate As [Purchase Date],
tblAssetCustom.Warrantydate As [Warranty Expiration]
From tblAssetCustom
Inner Join tblAssets On tblAssetCustom.AssetID = tblAssets.AssetID
Inner Join tblComputersystem On tblAssets.AssetID = tblComputersystem.AssetID
Inner Join tsysOS On tblAssets.OScode = tsysOS.OScode
Left Outer Join tsysIPLocations On tblAssets.IPNumeric >=
tsysIPLocations.StartIP And tblAssets.IPNumeric <= tsysIPLocations.EndIP
Where tblAssetCustom.Warrantydate < GetDate() And tblAssetCustom.State = 1 And
tblComputersystem.Domainrole < 2
Order By tsysIPLocations.IPLocation