Hi PerezAnguiar, Thanks to show your interest here, and thanks for your advise.
I am already using a custom solution for all of these changes.
Below fields are coming from my custom entity.
I used other ways(web API) to create a record for my SMS provider and successfully completed it. But Message Sender is must to be added for SMS channel and I am also not able to do it using API because create message is not implemented for the entity. This error is thrown when I try to do it using Web API and even CrmServiceClient.Create() method in C#.
I face below error when I try to do it using UI provided for this. The error looks to be returned by the server.
Now if I create a custom field in msdyn_channelinstace entity with my publisher, and even if I keep its name same, it's full name will be mm_extendedentityid_mm_messagemedia. After adding a custom entity, issue will be solved? I think no because the field that is missing right now will also be missing after adding custom field.
Please let me know if I understood it wrong, or anything else is there that I can try.
Thanks.