| T2312 | FATAL ERROR: T2312 | DESIGN OPTIMIZATION CONSTRAINT NOT DEFINED |
| Cause: | A design optimization analysis was performed with no design constraint defined. | |
| Action: | Specify at least one design constraint using either the DESGLB or DESSUB Case Control command and a corresponding DCONSTR or DCONADD Bulk Data entry. | |
| Remarks: | See the Case Control section for command format and the Bulk Data section for entry format. |