| Input Parameters | Significance |
| DtvLong idn | ident number of the field in the data base |
| Output Parameters | Significance |
| DtvLong *siz | definition length of the field in the table |
| Return Code | Significance |
| 0 | no error |
| 1 | field is not assigned to a table |
| -1 | data base error reading the field data |