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Database Assignment: Based on the POS & Stock Controller system shown below, design an appropriate ER diagram that reflects the specified system and then extract

Database Assignment: Based on the POS & Stock Controller system shown below, design an appropriate ER diagram that reflects the specified system and then extract the mapped tables showing them as flat tables.
A Point-of-Sale & Stock Controller System is an information system primarily used to monitor the sales and stock activities of a company.
In the POS & Stock Controller System it is possible to have the following entities:
Product
Product Category
Product Unit
Sales
Invoice
Receive Product
Customer
Supplier
Purchase Order
User
The possible relationships between them can be as follows:
The user determines the products (1 to N).
The user can handle multiple invoices (1 to N).
The user can manage the receiving transactions (1 to N).
The user can process the purchase order transactions (1 to N).
Product belongs to a certain category (N to 1).
Product has multiple product units (1 to N).
Product has multiple receiving transactions (1 to N).
Product is also included in the purchase order transaction (1 to N).
Purchase order will be forwarded to the supplier (1 N).
The supplier will supply the requested products (1 to N).
Product is included in multiple sales (1 to N).
Sales produce an invoice (1 to N).
An invoice is given to the customer (1 to N).
The last part of the ERD process is to add attributes to the entities as follows:
Product Entity has the following attributes:
Product ID primary key represented with underline
Code
Name
Unit Price
Unit in Stock
Discount Percentage
Re-Ordervel
Category ID foreign key
Unit ID foreign key
User ID foreign key
Product Category Entity has the following attributes:
Category ID primary key represented with underline
Name
Product Unit Entity has the following attributes:
Unit ID primary key represented with underline
Name
Sales Entity has the following attributes:
Sales ID primary key represented with underline
Invoice ID foreign key
Product ID foreign key
Quantity
Unit Price
Sub Total
Invoice Entity has the following attributes:
Invoice ID primary key represented with underline
Customer ID foreign key
Total Amount
Amount Tendered
Payment Type
Bank Account Name
Bank Account Number
Date Recorded
User ID foreign key
Receive Product Entity has the following attributes:
Receive Product ID primary key represented with underline
Product ID foreign key
Quantity
Unit Price
Sub Total
Received Date
Supplier ID foreign key
User ID foreign key
Customer Entity has the following attributes:
Customer ID primary key represented with underline
Code
Name
Contact Address
Supplier Entity has the following attributes:
Supplier ID primary key represented with underline
Code
Name
Contact
Email
Address
Purchase Order Entity has the following attributes:
Purchase Order ID primary key represented with underline
Product ID foreign key
Quantity
Unit Price
Sub Total
Order Date
Supplier ID foreign key
User ID foreign key
User Entity has the following attributes:
User ID primary key represented with underline
Fullname (FirstName, MiddleName, LastName)
Contact
Designation
Account Type
Username
Password

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