Hello, I have a question regarding AIMMS. I plan to do lab scheduling that will assign classes to a lab venue at a time. Each class will be taught by a different demonstrator, which I already specified in the parameter (Demo_Lab) as shown in the picture. However, whenever I included it in a constraint named Demo_Gap with an index domain (l,t), AIMMS did not follow the Demo_Lab parameter. AIMMS gave the results with a demonstrator randomly assigned to any class (you can refer to the final image). May I know how this is possible to happen?
![](https://uploads-eu-west-1.insided.com/aimms-en/attachment/50f3fe7d-171d-4a12-9d95-437ea66445b0.png)
![](https://uploads-eu-west-1.insided.com/aimms-en/attachment/401f4757-cf80-4023-a47b-f7436c5b936b.png)
![](https://uploads-eu-west-1.insided.com/aimms-en/attachment/eb327476-6160-4b23-95f2-9fcd428d5d9a.png)
![](https://uploads-eu-west-1.insided.com/aimms-en/attachment/d18d8fa2-8cdc-4b38-9f1e-48498273d548.png)