The error message "Business transaction cannot be carried out" (system message BS013) is a standard message from SAP's status management. It indicates that the system is preventing a user from performing an action due to a status restriction or a failed authorization check. When a network is released, this single action triggers several subsequent business transactions, such as creating material reservations or purchase requisitions. If the user's authorization profile is missing the necessary permissions for any of these follow-on transactions (e.g., authorization to create a material reservation), the entire primary transaction (the release) is halted, and this generic error is displayed.

A. Missing budget for material components: An insufficient budget would typically trigger a specific error message from the Availability Control function, such as "Budget exceeded," not this generic status management error.

B. Missing reservations for material components: Material reservations are a result of releasing the network activity. They are created during the release process, so their absence cannot be the cause of the release failure.

C. Missing material availability: A material availability check failure usually generates a specific warning or error message detailing the material shortage. The system can also be configured to allow the release despite missing components.

1. SAP Help Portal, Status Management (BC-BMT-WFM-STA): "If a user tries to carry out a business transaction that is forbidden by a status, the system issues an error message and does not carry out the transaction." This confirms that the error is related to a forbidden transaction, which can be due to authorization settings linked to a status. (Accessed via SAP Help Portal, search for "Status Management Business Transaction").

2. SAP Note 159641 - "BS013 for release of network/activity": This official SAP Note directly addresses the scenario. It states: "When you release a network or an activity, the system may generate the message 'BS013: Business transaction 'Release' cannot be carried out'. The cause may be missing authorizations for follow-on documents (purchase requisition, reservation, and so on)." This provides a direct link between the error message and missing authorizations for material components.

3. SAP Training Course PLM220 - Project Management: Logistics: This course material explains the integration between Project System (PS) and Materials Management (MM). In the unit on materials, it details that releasing a network activity triggers procurement processes. It clarifies that the user performing the release must have the appropriate authorizations not only in PS but also in MM to create reservations or purchase requisitions. A failure in these authorization checks prevents the release. (Reference: PLM220 coursebook, section on "Material Procurement in Projects").