Business Central Projects does not directly post resource costs to the G/L. Resource and labor costs recorded on projects are generally used for project costing, billing, and capacity tracking, while the actual financial cost of employees or technicians is typically posted separately through payroll. WIP can be used to recognize project costs in the G/L, but it may not fully meet requirements where resource costs need to be posted directly to financial accounts.
If resource costs need to be posted directly to the G/L from project activities, customization is required to extend the standard functionality. Acumens Advanced Projects extension addresses this requirement by allowing resource costs to be posted to the G/L, with the costs reflected in the configured COGS and Overhead Applied accounts.
To post resource cost to the G/L:
Configure COGS and the Overhead Applied Account in the General Posting Setup.

Create a project and add project task lines.

Update planning lines to be posted.

Create Project Journal lines.

Open and review created Project Journal lines. This will include the resources.

Post Project Journal lines.

Once posted, the resource cost will also be posted to the G/L account based on the general posting setup.

For more details: https://acumens.com/Blog/advanced-projects-business-central/#post-resource-cost-to-the-gl