Have you tried assigning a size to the NUMERIC? Example:  numeric (11,0) or numeric (5,7)?

Also, I thought the DATATYPE of a column auto-assigned by the database was IDENTITY, not numeric.

So I removed this column from datawindwo and tried and got another error It seems like the Data window converter is throwing error on every column that was defined with user-defined datatypes.

Extracted SQL example:

CREATE TABLE dbo.ticket
(
ticket_ident dm_identity IDENTITY,
contract_nbr char(7) NOT NULL,
ticket_book_nbr int NOT NULL,
status_cd dm_code NOT NULL,
ticket_dt dm_datetime NOT NULL,

pre-defined user datatypes in DB

dm_identity = Numeric(8.0)
dwm_code = Char(5)

This is just my understanding, I don't know how SnapDevelop looks datatypes for each column in a datawindow. my datawindow column specs looks like this:

PB 2021 did resolve this issue, Thanks