Return Code	Significance
0	no error
-1	field Id is NULL
1	wrong row position
2	text string is zero pointer
3	wrong field type

The pointer > dat < must correspond to the type of the field:

• char *dat for fields of the type string and calculate,
• DtvLong *dat for fields of the type integer and boolean,
• float *dat for fields of the type float and money.

In > drt < you can specify, how the function is to treat the field-dirty-flag:

• drt = > 0 < do not change dirty flag,
• drt = > -1 < reset dirty flag (> 0 < ).
• drt = > 1 < set dirty flag to modified (> m < )