i keep getting this message Msg 1778, Level 16, State 0, Line 23 Column 'salesman.salesman_id' is not the same data type as referencing column 'Customer.salesman_id' in foreign key 'FK_salesman_id'.

Programming with Microsoft Visual Basic 2017
8th Edition
ISBN:9781337102124
Author:Diane Zak
Publisher:Diane Zak
Chapter11: Sql Server Databases
Section: Chapter Questions
Problem 6E
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create database GA2
go
use GA2
go
create table salesman(
salesman_id int primary key, 
name varchar(30), 
city varchar(20), 
commission varchar(30)
);
insert into salesman (salesman_id, name, city, commission) values (5001, 'James Hoog', 'New York', 0.15);

insert into salesman (salesman_id, name, city, commission) values (5002, 'Nail Knite', 'Paris', 0.13);

insert into salesman (salesman_id, name, city, commission) values (5005, 'Pit Alex', 'London', 0.11);

insert into salesman (salesman_id, name, city, commission) values (5006, 'Mc Lyon', 'Paris', 0.14);

insert into salesman (salesman_id, name, city, commission) values (5007, 'Paul Adam', 'Rome', 0.13);

insert into salesman (salesman_id, name, city, commission) values (5003, 'Lauson Hen', 'San Jose', 0.12);

Create table Customer (
customer_id int primary key, 
cust_name varchar(30), 
city varchar(10), 
grade varchar(30), 
salesman_id varchar(30),
CONSTRAINT FK_salesman_id FOREIGN KEY (salesman_id) REFERENCES salesman(salesman_id)
);

i keep getting this message

Msg 1778, Level 16, State 0, Line 23
Column 'salesman.salesman_id' is not the same data type as referencing column 'Customer.salesman_id' in foreign key 'FK_salesman_id'.
Msg 1750, Level 16, State 1, Line 23
Could not create constraint or index. See previous errors.

can you show me how to fix it, its SQL Server

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