Hello Michael,
You can configure access to Financial Forecast for Procurement since release of 1405.
Here is the extract from the release notes from FP 1405
"You can now forecast the budget consumption based on open purchase orders that have goods to be delivered, before the actual consumption through a goods receipt. The budget planned on cost center and projects are considered when a purchase order is raised with a cost assignment for cost center or project. This function enables you to forecast a procurement scenario to efficiently manage your budget, by having an estimate of future expenses at the cost center or project level."
and
"You can now forecast the budget consumption based on open purchase orders. To find the business option to configure this, select your implementation project and click Edit Project Scope. In the Scoping step of the project, ensure that Management Accounting is selected within Financial and Management Accounting. Expand the Management Accounting scoping element and select Financial Planning. Select and answer the question under Group: Financial Forecast. Following this, you can configure the fine-tuning activity Financial Forecast."
I hope this will solve your requirement.
Best regards
Nick