DT_MSILINK - Represent the links between MESLink (Member, Section and optionally Exercice) and section items.
| Code | Type | Description | 
| MSI_ID | Number | Identifier - Auto-generated | 
| MES_ID | Foreign Key | Link to meslink. Mandatory | 
| ITM_ID | Foreign Key | Link to section item. Mandatory | 
| ITL_ID | Foreign Key | Link to item level, if applicable. | 
| MSI_VA_VALUE | String(2000) | Item value, if this have to be freely entered by the user | 
| MSI_DT_VALIDITYLIMIT | Date | Validity limit, if applicable |