I have 2 tables joined as follows:

SELECT *
FROM COSTCATEGORIES C,
COSTCATEGORYDEFINITIONS
WHERE C.COSTCATEGORYNO=COSTCATEGORYNO

The COSTCATEGORIES table is displayed in a TIB_Grid. All works fine
except I can not edit any fieldd in the grid. If I remove the join
as follows:

SELECT *
FROM COSTCATEGORIES

I can now edit in the grid ?
Can anyone help ?
Thanks