There might be 2 reasons, that order went to Problem order after creation.
1. There is no sufficient stock for selected SKUs
2. If user selected "Condition" as a 'Unusable' while creating an order and there is no such stock of Unusable goods for specific SKU.
While creating an B2B order Anchanto WMS have both option, the order is for Usable or Unusable goods. Based on stock availability order can be processed