Billing plans can be created for WBS elements and sales order items. Billing plans areused to define billing dates and billing amounts for periodic or milestone billing. WBS elements can be assigned to billing plans if they are assigned to a sales document item or if they have a billing element indicator set. Sales order items can be assigned to billing plans if they have a relevant item category and billing relevance. Reference:https://help.sap.com/doc/0f069b2e08b748f1b480d4c8b46c3c49/100/en-US/6a7a9f0a6e421014e10000000a174cb4.html

To create purchase requisitions for the materials used in your project, you must ensure that the materials have a procurement type that allows external procurement and a material number that identifies them uniquely. Some of the possible reasons why no purchase requisitions have been created after releasing the project are:

• The procurement type in the material master is set to in-house production (E). This means that the material is produced internally and not procured externally from a vendor.
• The material has no material number (N). This means that the material is a non-stock item that is not managed in inventory and has no master record. Non-stock items require manual creation of purchase requisitions. Reference: https://help.sap.com/docs/SAP_S4HANA_ON-PREMISE/4dd8cb7b1c484b4b93af84d00f60fdb8/79ceb65334e6b54ce10000000a174cb4.html?&version=1909.002

Capacity requirements are the demand for capacities that result from planned or actual orders. If a work center is overloaded, it means that its capacity requirements exceed its available capacities. To reduce the overload of the work center, you can trigger automatic capacity leveling inside the project planning board, which is a tool that allows you to plan and monitor capacities for network activities. You can also shift activities backward or forward on the time axis where more capacities are available, which means changing their start and finish dates manually or automatically. Reference:https://help.sap.com/doc/0f069b2e08b748f1b480d4c8b46c3c49/100/en-US/6a7a9f0a6e421014e10000000a174cb4.html

Project versions are copies of projects that allow you to save snapshots of project data at different points in time. Project versions are mandatory for Milestone Trend Analysis (MTA), which is a tool that allows you to monitor and compare the planned and actual dates of milestones in a project over time. Project versions can be created automaticallybased on user status, which means that you can define rules that trigger the creation of project versions when certain user statuses are set for project objects. Reference:https://help.sap.com/doc/0f069b2e08b748f1b480d4c8b46c3c49/100/en-US/6a7a9f0a6e421014e10000000a174cb4.html

Requirements grouping of materials is a process that allows you to plan and procure materials jointly for several WBS elements within a project or across projects. To use requirements grouping of materials, the materials must allow sales order or project stock, which means they must have a special procurement type of E or Q in the material master. An MRP group must also be assigned to the materials, which defines the parameters for material requirements planning, such as lot size and planning strategy. Reference:https://help.sap.com/doc/78f5c353b677b44ce10000000a174cb4/700_SFIN20%20006/en-US/0814c353b677b44ce10000000a174cb4.html

PPIDS master data is necessary for using PP/DS, which is a component of SAP APO that provides advanced planning and scheduling functions for production planning and detailed scheduling. PPIDS master data includes material and resource data. Material is a set of data that defines the characteristics and properties of a product that can be produced or procured. Resource is a set of data that defines the characteristics and capacities of a production facility that can be used to produce products. Reference:https://help.sap.com/doc/saphelp_scm700_ehp02/7.0.2/en- US/69/f3055130534338e10000000a154ce5/content.htm