You have observed that the One-Off solutions disappears from SDK after you have deployed the Multi Customer Solution to your tenant.
You will also observe that the functionality associated with the One-Off solutions will be working fine even though the solutions are missing in SDK.
Reproducing the Issue
- Login to SDK.
- Deploy the MCS solution.
- You will notice that the One-Off solutions are missing which were there before.
The solutions are actually present in the tenant but you cannot view them because in customer test tenant you can either view MCS or One off solution at a time in SDK and not both. Only in partner development tenants both will be visible.
This is the reason why the functionality assosiated with the solutions will be working fine in the UI even though you are unable to see them in SDK.
You will have to unassign the work center view of either MCS or One-Off in the Access Restriction tab of your user in Application and User Management work center and then view One off or MCS accordingly as per your requirement.
KBA , SRD-CC , Cross Components , How To