Google Sheets question about row_number

[HenryPuppet]

Describe the problem/error/question

Could someone explain what row_number is referring to?
It’s a selection option for which column I’m interested in but I don’t have a column with that name.

What is the error message (if any)?

None

Please share your workflow

See image

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)

Share the output returned by the last node

Information on your n8n setup

• n8n version:
• Database (default: SQLite):
• n8n EXECUTIONS_PROCESS setting (default: own, main):
• Running n8n via (Docker, npm, n8n cloud, desktop app):
• Operating system:

[Franz]

Thats the row_number

The fields are taken from the head row of your spreadsheet.
When you change the head row, the node must be reloaded.
Simply change Mapping Column Mode to Map Automatically and back to Map Each Column Manually.

[HenryPuppet]

Ah, that makes sense.
Thank you for taking the time to respond.