64a202ff6e
The Move dialog's predecessor check flagged every unfinished step before the destination — including the from_step itself, which is in-progress by definition when advancing partial parts out of it. So any "Send → next" to a not-yet-started step showed a hard "Predecessor not done: <from_step>" blocker and greyed out SEND (reproduced on WO-30061: Racking → Ready for processing). This broke partial advance for ALL quantities, not just 1-part orders. Fix: _blockers_for_move only blocks unfinished steps STRICTLY BETWEEN from_step and to_step (you'd be skipping an incomplete intermediate stage). Immediate-next advance is allowed; skip-ahead still blocked; backward (rework) moves unblocked. Verified on entech: blocker no longer fires for Racking → Ready for processing. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>