I have some difficult about SAPbyD. Firstly, I want to explain my task. My task has three paths. The flow of my task is "purchase order > custom BOs > supplier invoice". The first one is the PO record is stored at my first custom BO. And then some action is done at first custom BO and save record at second custom BO at the same time of first custom BO's action time. And then some action is done at second custom BO and create these data to "Supplier invoice" as "Supplier invoice" records. So, I tried with[DeploymentUnit(SupplierInvoicing)] at the second Custom BO, but it was not OK. Because of when the second BO is declared [DeploymentUnit(SupplierInvoicing)], second custom BO's fields are "read only" at the code for data creation. So, I also declared [DeploymentUnit(SupplierInvoicing)] at the first custom BO. At this time the PO records can't create at the first custom BO because the first custom BO's fields are also "read only" fields. So,I want to know the way to create data between different deployment unit. Could you please check and answer for this?