| T2127 | FATAL ERROR: T2127 | GRID id IS EXTERNAL TO SUPERELEMENT id AT GRID id |
| Cause: | An MPC or RBEi Bulk Data entry defined a multipoint constraint equation that crossed a superelement boundary. All multipoint constraint equations must be contained within either the residual set or a superelement boundary. | |
| Action: | Check for any MPC or RBEi Bulk Data entries that contain both of the grid point identification numbers specified. | |
| Remarks: | See Autodesk Nastran Reference Guide, Section 4, Bulk Data, for entry format. |