https://userapps.support.sap.com/sap/support/knowledge/en/2733301
2733301 - Wave Update failed - Cancel Picking - /SCWM/WAVE181 | SAP Knowledge Base Article
A user tries to do cancel pick for an ODO or a HU via tcode /scwm/cancpick, the following errors: Processing error (not possible to save), message no. is...
update failed