I have the same error here, looking forward to a solution. I can not deposit new item to a collection with dspace cris 7. It display that There was an issue when submitting the item, please try again later.
2021-07-15 16:20:12,255 INFO org.dspace.app.rest.submit.step.DescribeStep @ Called child form:publication-dc-contributor-author
2021-07-15 16:20:12,266 INFO org.dspace.app.rest.submit.step.DescribeStep @ Called child form:publication-dc-contributor-editor
2021-07-15 16:20:12,361 INFO org.dspace.app.rest.submit.step.DescribeStep @ Called child form:publication_references-dc-relation-funding
2021-07-15 16:20:12,832 INFO org.dspace.xmlworkflow.storedcomponents.XmlWorkflowItemServiceImpl @ admin@localhost::update_workflow_item:workflowitem_id=23
2021-07-15 16:20:12,841 INFO org.dspace.content.Item @ admin@localhost::update_item:item_id=b44c1d31-61fe-4584-a06f-782b8af4884f
2021-07-15 16:20:12,849 INFO org.dspace.content.Item @ admin@localhost::update_item:item_id=b44c1d31-61fe-4584-a06f-782b8af4884f
2021-07-15 16:20:12,881 INFO org.dspace.content.Item @ admin@localhost::update_item:item_id=b44c1d31-61fe-4584-a06f-782b8af4884f
2021-07-15 16:20:12,921 INFO org.dspace.xmlworkflow.XmlWorkflowServiceImpl @ admin@localhost::start_workflow:org.dspace.xmlworkflow.state.actions.userassignment.NoUserSelectionAction@60bdb733 workflow_item_id=23item_id=b44c1d31-61fe-4584-a06f-782b8af4884fcollection_id=eb203706-20bc-4768-b477-612c26d9215e
2021-07-15 16:20:12,925 INFO org.dspace.content.Item @ admin@localhost::update_item:item_id=b44c1d31-61fe-4584-a06f-782b8af4884f
2021-07-15 16:20:12,952 INFO org.dspace.usage.LoggerUsageEventListener @ admin@localhost::workflow_item:item_id=b44c1d31-61fe-4584-a06f-782b8af4884f
2021-07-15 16:20:12,981 INFO org.dspace.usage.LoggerUsageEventListener @ admin@localhost::workflow_item:item_id=b44c1d31-61fe-4584-a06f-782b8af4884f
2021-07-15 16:20:12,984 WARN org.dspace.app.rest.exception.DSpaceApiExceptionControllerAdvice @ Request is invalid or incorrect (status:400)
Thank you very much.
Giang