_Spin_system_link.From_spin_system_ID
| Description | Pointer to '_Spin_system.ID' |
| Details: | |
| part of local key (identifies unique row in a table in the entry) | |
| Parent saveframe | resonance_linker |
| Data type | int |
| DB table | Spin_system_link |
| DB column | From_spin_system_ID |
| DB type | INTEGER |
| NULL allowed | no (mandatory) |
| part of primary key | |