I am trying to use BAPI_PR_CREATE to create purchase requisitions. The thing is that it works for materials but I couldn't make it work for services. Making a little bit of research I have seen that there is supposed to be a structure called "SERVICEACCOUNT" within such bapi, but I don't find it. My question is, do I have to do something to add such structure? If so, could you please detail the steps to be followed?