The installation of the Clever Landed Cost App creates a Permission Set called Clever Landed Cost, with the ID LANDED COST CLCTMN.

It’s recommended this is assigned to all users even if they are not directly using the app, as the tasks they carry out within the application could potentially write to the Landed Cost tables indirectly.
The Clever Landed Cost Permission Set is also included in the Clever Apps Permission Set, which is installed with Clever Config. If your users are already assigned Clever Apps, they receive the Clever Landed Costs permissions automatically.
Note: when you upgrade Clever Landed Costs, any users or user groups assigned to an older Clever Landed Costs Permission Set are moved to the Clever Landed Cost Permission Set automatically.