"INSERT EXEC statement cannot be nested" with dynamic query - sql-server

Question

BACKGROUND
I have a procedure that has INSERT INTO ... EXEC (#sql) from dynamic SQL.
This procedure's results is INSERTed INTO table outside of procedure. When I attempt this, I get get an error:
[S0001][8164] An INSERT EXEC statement cannot be nested.
This error is discussed in other questions, but for inner procedures' calls instead of dynamic SQL:
Errors: "INSERT EXEC statement cannot be nested." and "Cannot use the ROLLBACK statement within an INSERT-EXEC statement." How to solve this?
An insert exec statement cannot be nested
Example with error:
-- =================================
-- table with test data
-- =================================
CREATE TABLE dbo.TestInsertIntoDynamicData1
(
data nvarchar(max)
)
INSERT INTO dbo.TestInsertIntoDynamicData1
VALUES ('one1'), ('two1'), ('three1')
GO
-- =================================
-- another table with test data
-- =================================
CREATE TABLE dbo.TestInsertIntoDynamicData2
(
data nvarchar(max)
)
INSERT INTO dbo.TestInsertIntoDynamicData2
VALUES ('one2'), ('two2'), ('three2')
GO
-- =================================
-- procedure with dynamic query
-- =================================
CREATE PROCEDURE dbo.TestInsertIntoDynamicProc
#TableName nvarchar(100)
AS
BEGIN
DECLARE #Results table(
data nvarchar(max)
)
DECLARE #sql nvarchar(max)
SET #sql = '
SELECT data
FROM dbo.' + #TableName + ';
'
-- FIRST INSERT INTO ... EXEC ...
INSERT INTO #Results -- this INSERT is required for example
EXEC (#sql)
SELECT *
FROM #Results;
END
GO
-- =================================
-- CALL
-- =================================
DECLARE #ResultsOfProc table(
data nvarchar(max)
)
-- SECOND INSERT INTO ... EXEC ...
INSERT INTO #ResultsOfProc (data)
EXEC dbo.TestInsertIntoDynamicProc #TableName = 'TestInsertIntoDynamicData2'
SELECT *
FROM #ResultsOfProc;
GO
DROP TABLE dbo.TestInsertIntoDynamicData1
DROP TABLE dbo.TestInsertIntoDynamicData2
DROP PROCEDURE dbo.TestInsertIntoDynamicProc
https://stackoverflow.com/a/2917775/7573844
QUESTION
How can we get around this error?

Answer 1

Move INSERT INTO to dynamic query.
Refactor table variable to temp table in order to use it in dynamic query.
Fixed procedure:
CREATE PROCEDURE dbo.TestInsertIntoDynamicProcFixed
#TableName nvarchar(100)
AS
BEGIN
CREATE TABLE #Results ( -- refactor to temp table
data nvarchar(max)
)
DECLARE #sql nvarchar(max)
SET #sql = '
INSERT INTO #Results -- move INSERT to here
SELECT data
FROM dbo.' + #TableName + ';
'
-- FIRST INSERT INTO ... EXEC ...
EXEC (#sql)
SELECT *
FROM #Results;
END
GO