M204: Set a Loop Structure

 

All Steps are connected by the arrow pathways. An arrow pathway may be in the form of a loop. It also supports hierarchical (multiplexing) loops or advanced loops called "non-block structures", as well as a simple "Send-back flow". However, a loop structure that may cause an infinite proliferation of split tokens (control identifiers) results in a definition error.

1. Draw Loop Structure

a. Draw a Return Path

To go back to the previous Step connect a reverse route in addition to the forward route

b. Draw an Annular Pathway

In order to be able to redo a step connect a path for the return

• Although it is possible to compose a loop pathway with only automatic processing, it will throw an error when the number of actual processes exceeds 500
• [Apps] in which an Issue token can Split infinitely are inoperable (i.e. A Split Model which includes a pathway that returns to the original Step without merging)

2. Correct the Error of the Split Point

 

a. Individual Looping

Eliminate pathways which go upstream of the Split point

b. Post-Merge Looping

Create a returning pathway upstream of the Split point after merging at a Join Gateway

• You must be careful when using both a looping structure and multiple Split Gateways (AND Split/OR Split).
• The combination of Single Split Gateway (XOR Split) and a looping structure will not cause an error regardless of how it is arranged.

BPMN Icons: Human Task
BPMN Icons: Inclusive Gateway (OR)
BPMN Icons: Parallel Gateway (AND)
BPMN Icons: Exclusive Gateway (XOR)

---

X. Blog articles

• I Hate Such a Workflow! – Can’t Send Back!
• I Hate Such a Workflow! – Nobody Proofreads!

X. Business Apps

• Order Report Flow
• Manga Production Flow