I've not been able to get a definitive answer for this question.
Is there a way to upload/add manual pricing conditions in a PO? I've tried MASS, MEMASSPO there is no way I can add a new condition in the PO as there is no condition value field in EKPO table.
The other transactions such as MR21, MEI1/2 also seem to support only automatic conditions.
Is LSMW the only way forward?