Explanation
Authorization object M_EINK_FRG for the release of purchasing documents contains the following fields:
Release strategy, which defines the release codes and release indicators that are required for releasing a purchasing document.
Release group, which groups together purchasing documents that have similar release characteristics such as document type or value limit. References: SAP S/4HANA Sourcing and Procurement | SAP Learning, Course S4520, Unit 1, Lesson 1.