COST AND BUDGETYou have assigned a budget to WBS element with your projectWhat budget function...

 Availability control is a budget function that can be used to check assigned values against the current budget. Availability control monitors whether the budget for a project is sufficient for planned and actual costs. Availability control compares the assigned values (such as commitments, actual costs, or funds reservations) with the current budget and issues warnings or errors if the tolerance limits are exceeded. Availability control helps you to prevent budget overruns and ensure compliance with budget policies. Reference:https://help.sap.com/docs/SAP_S4HANA_ON-PREMISE/4dd8cb7b1c484b4b93af84d00f60fdb8/79ceb65334e6b54ce10000000a174cb4.html? &version=1909.002