NetworkFlowOrientor returns no output

Hi everyone,

I am working in FME and would like to orient the flow direction of a gas network.

Data:

• main supply lines

• service lines connected to gas connections

• Destination  points – representing the gas service connection locations

Objective:

My goal is to ensure that all Service lines are oriented towards the Gas Service connection points.
If a line is digitized in the opposite direction, it should be automatically reversed.

Additionally, some lines connected to Service Connection points   are split into multiple segments. I need all connected segments to have a consistent direction towards the same Service Connection points .

What I tried:

• I used the NetworkFlowOrientor transformer

• I applied a Anchoredsnapper beforehand to ensure that each Service connections point lies exactly on the endpoint of the corresponding Service  lines

Problem:

• The NetworkFlowOrientor returns no output

Questions:

1. What is the correct workflow to ensure that all Service  line segments are consistently oriented toward the destination points?

2. I am not using Group By. Should I use it, or do I need to define a source (supply)?

Could someone please share a working sample workflow that uses NetworkFlowOrientor to help me understand how it works?

Any help or suggestions would be greatly appreciated.

FME 2021

Thanks in advance!