Load Serving Entities (LSEs) that choose to use a Fixed Resource Adequacy Plan (FRAP) must designate a sufficient volume of Planning Resources located in the same (Local Resource Zone) LRZ as their Planning Reserve Margin Requirement (PRMR). This is to meet their Local Resource Zone requirement. 
The formula used to calculate this requirement can be found under “Fixed Resource Adequacy Plan (FRAP) in BPM 011 – Resource Adequacy.