Cecil,

It's documented in VFP8 help under Behavior Changes Since Visual FoxPro 7.0 and in INFO: SQL SELECT Behavior Changes in Visual FoxPro 8.0 mskb #813361.

>The following code, worked in VFP 8.0 but not VFP 8.0. What's up? An error message stated that a GROUP BY clause was either missing or invalid.
>
>SELECT ;
> V_POHeaderPI.Project_No, ;
> V_POHeaderPI.Account_No, ;
> V_POHeaderPI.PO_Main, ;
> V_POHeaderPI.PO_Total, ;
> V_POHeaderPI.PO_Status, ;
> SUM(V_POCostsPI.cs_amount) AS nInvoiced ;
> FROM V_POHeaderPI;
> LEFT OUTER JOIN V_POCostsPI ON V_POHeaderPI.PO_Main = V_POCostsPI.PO_Main ;
> WHERE ;
> V_POHeaderPI.PO_Main = ThisForm.cPO_Main AND ;
> PO_Status <> "U" ;
> INTO TABLE tmpPOHeader