Add support for updating Unit of Measure (UM) field via API

Description:
Currently, the API does not support updating the Unit of Measure (UM) field for cost sources. Our team requires this functionality to ensure data consistency and accuracy in our quotes and proposals. We kindly request that this feature be added to the API in a future release.

Use Case:
Our team uses the API to update various fields, including the UM field, to maintain data integrity and automate workflows. The absence of this functionality forces us to manually update the UM field, which can lead to errors and inefficiencies.

Benefits:
Adding support for updating the UM field via API will enable our team to:

• Automate workflows and reduce manual errors

• Improve data consistency and accuracy

• Enhance overall efficiency and productivity