STD - States of documents and entities

We need to add states to important documents/entities in the system. The minimal state workflow should be

• draft: all new documents are creating with this state
• accepted: documents could be accepted, it  influences on future possibility and behaviour
• declined: documents declined, it  influences on future possibility and behaviour

This functionality is provided for the following documents:

• material requirement 
• work plan
• cost calculation 
• production counting 

Each state changing should be logged with informations who and when the action executed