Currently in the APP there is a partial missing functionality which will be fully resolved in CE2105.
See KBA 3017691 https://launchpad.support.sap.com/#/notes/3017691
The following workarounds are available.
In the APP Manage Purchase Orders.
- In create mode if you copy an existing line the custom field values are copied
- Do not copy the PO from the initial screen, choose create and then in create mode use the 'Add from Document' option
**This will copy the PO in the same way including the custom fields
Use advanced webgui tile (ME21n) where custom fields are copied
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