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'C' – corresponds to the creation/update request,
'D' – corresponds to the deletion request.
If you want to delete the given object in the Cloud, you must create an IDoc with TRANSACTION_TYPE = 'D'.
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It can be the case however, that the object does not exist in the SAP any longer and we want to delete it in the Cloud as well. In that case resending this object with deletion flag is problematic. In that case the transaction /PACG/ECM_SEND_DELRQ can be used.
Two ways of usage of this transaction are possible:
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