Thank you very much for your reply. Although my current software is using the 2019R3 version, according to the header file description of the 2019R3 version, it supports the linearization of DPM source items, and its specific description is shown in the figure above. But this version of the help manual does not explicitly give any details on how to use it (even if it is described in the 2022 or 2023R2 version of the manual, it is still not very clear and does not even describe any information about *mtc). So I don't know how to assign *mtc the correct value. If you can provide any useful information, I would be very grateful!