@Kevin Plunkett I believe this thread will give you the answers you are seeking: 

It does seem that the solutions are manually-oriented but that there is more than one option.

Thank you but this goes nowhere near to answer the question I’ve asked.  Dynamics if the Microsoft CRM, Financial & ERP platform and having the ability to be able to understand the ERD that supports this would be massively useful.  

Hi @Kevin Plunkett, 

Thanks for following up! A workaround alternative to manually building your ERD is to format your data as a PostgreSQL, using the attached document for reference. If you can export your data from Microsoft Dataverse in the attached format, you can then upload your data as shown below.

1. From a Lucidchart board, select File > Import > Data > Entity relationship (ERD) > Import from SQL Database

2. Select PostgreSQL > Next > and follow the prompts to upload your files

I hope that is helpful! Please let me know if you have any further questions! I would be happy to help find another solution for you.

I created a custom script for dataverse.
I cheated a bit with constraints and the ordinal position of columns, but it does the trick.

The result of the script can be used the same as a normal MSSQL database
 

SELECT			'sqlserver' dbms,
				d.name AS TABLE_CATALOG,
				s.name AS TABLE_SCHEMA,
				t.name AS TABLE_NAME,
				c.name AS COLUMN_NAME,
				c.column_id AS ORDINAL_POSITION,
				dt.name AS DATA_TYPE,				
				CASE
					WHEN dt.name = 'nvarchar' THEN c.max_length
					ELSE NULL
				END AS CHARACTER_MAXIMUM_LENGTH,
				CASE
					WHEN pk.CONSTRAINT_TYPE = 'PRIMARY KEY' THEN pk.CONSTRAINT_TYPE
					ELSE 
						CASE
							WHEN fk.CONSTRAINT_TYPE = 'FOREIGN KEY' THEN fk.CONSTRAINT_TYPE
							ELSE NULL
						END

				END AS CONSTRAINT_TYPE,
				fk.TABLE_SCHEMA,
				fk.TABLE_NAME,
				fk.COLUMN_NAME
FROM			sys.tables t 
INNER JOIN		sys.databases d ON d.database_id = t.DatabaseId
INNER JOIN		sys.schemas s ON s.schema_id = t.schema_id
INNER JOIN		sys.columns c ON c.object_id = t.object_id
INNER JOIN		sys.types dt ON dt.system_type_id = c.system_type_id
LEFT JOIN		(
					select 
						tc.column_id,
						t.object_id,
						'PRIMARY KEY' AS CONSTRAINT_TYPE
					from 
						sys.schemas s 
						inner join sys.tables t   on s.schema_id=t.schema_id
						inner join sys.indexes i  on t.object_id=i.object_id
						inner join sys.index_columns ic on i.object_id=ic.object_id 
													   and i.index_id=ic.index_id
						inner join sys.columns tc on ic.object_id=tc.object_id 
												 and ic.column_id=tc.column_id
					where i.is_primary_key=1 

					) AS pk ON pk.column_id = c.column_id AND pk.object_id = t.object_id
LEFT JOIN		(
					SELECT		fk_tmp.parent_column_id,
								fk_tmp.parent_object_id,								
								'FOREIGN KEY' AS CONSTRAINT_TYPE,
								fk_s.name AS TABLE_SCHEMA,
								fk_t.name AS TABLE_NAME,
								fk_c.name AS COLUMN_NAME
					FROM		sys.foreign_key_columns fk_tmp
					INNER JOIN	sys.tables fk_t ON fk_t.object_id = fk_tmp.referenced_object_id
					INNER JOIN	sys.schemas fk_s ON fk_s.schema_id = fk_t.schema_id
					INNER JOIN	sys.columns fk_c ON fk_c.object_id = fk_t.object_id AND fk_c.column_id = fk_tmp.referenced_column_id
				) AS fk ON fk.parent_column_id = c.column_id AND fk.parent_object_id = t.object_id

Hi ​@Rolf Schouteten, thank you for sharing this!