How can I create Projects (OPPOR) with REST?

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Hi,

I'm trying to create projects (GESOPP) through REST Webservice..

I can create into OPPOR table but when I try to create for OPPORCRM (needed to be visible in GESOPP function) get the error message: "A Pre-sales or After-sales step must be specified".

I already tried creating manually an entry in "OPPORSTB" (pre-sale) but it still ain't working.

I really need help.

Best Regards