RCM Reference The reference number assigned by APM to the function. Functions are numbered sequentially in the order in which they are created. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to function ID, functional failure ID, and cause ID in AWB. See Also Asset Name and number assigned to the asset. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the function ID in AWB. See Also