Is it possible to execute code within a workflow ?

Hi, I would like to know if it is possible to execute code in a workflow task without having to send the task to an agent since what i need to do doesnt need an agent, the scenario is as follows:

i have a function module that should get data from SAP tables and fill the task container with them, then the task container exports them to the workflow container where they should be used in the rest of the workflow, the problem is i didnt add an agent assignment to the task or the activity that calls it since this task doesnt need to run by any user and now the rest of the workflow doesnt execute