When upgrading a locally defined shape or item to a dictionary item, it tries to scrap it if there's already a definition for that to replace it, instead of creating a new one. This fails in cases where networks are unreliable and thus the implementation doesn't close messages boxes correctly. Everything should have been closed properly.
Thanks for reaching out to us about this issue - our development team is aware of this. We appreciate your patience. To request updates regarding this issue, please reference ticket# SPM-9180
KBA , BPI-SIG-PM-DIC , Dictionary for SAP Signavio Process Manager , How To
SAP Signavio Process Manager all versions ; Signavio Process Manager all versions