pymysql.err.DataError: (1406, "Data too long for column 'letter' at row 4")

ERPNext
1

Hello, I’m working to customize my quotation form, and I add a new section with a link to the Terms and Conditions and also a text editor to get the data from the select term.
I’m sure that i made everything well but I get a strange error that says that the Data too long for column ‘letter’ at row 4

as you can see below

1
11357×481 44.2 KB
2
21253×597 28.7 KB

I can’t retrieve the terms to the text editor now

2

The use the link Type is documented here: https://docs.erpnext.com/docs/v13/user/manual/en/customize-erpnext/articles/creating-custom-link-field

Might it be necessary to add a Doctype in the Default box?