Signing limits to be used with Inventory management workflows

Description of problem:
We are now trying to setup the new workflow for Inventory counting. The workflow is setup with assignment type = Hierarchy for approval and depending on approval limits this decides how much each role can approve before it should escalate to the next worker/manager according to the hierarchy.
But- we are missing the signing limit document type for inventory (Organisation administration-->Setup-->Signing limits-->Signing limits policies) - if we don´t have them we cannot setup signing limits to use in the inventory workflow.

In this case with the inventory counting journal workflow- the signing limits should be based on the cost amount on the counting journal line. Typically- you need an approval depending on how big the inventory counting difference is. The bigger the difference in cost- the routing to next level manager should be possible based on these limits.