sqlwrite object already exists

Greetings excellent people!

(I am aware that a question already exists with roughly the same name, but it is several years old and does not seem to pertain to my problem).

I have run into the following error:

Error using database.odbc.connection/sqlwrite (line 144)

ODBC Error: ODBC Driver Error: ODBC Driver Error: [Microsoft][ODBC SQL Server Driver][SQL Server]There is already an object named 'Declared_values' in the

database..

Now, the sqlwrite function documentation says that if a table already exists in the sql database, the function appends the data in the MATLAB table as rows in the existing database table. I am at a loss here! I would welcome any suggestions. I have checked spelling, capital/noncapital letters, conn.message returns [], and I can both find and edit the database in Microsoft SQL Server Manager, which means I have edit rights. If I run

test = sqlread(conn,tablename);

It gives me the proper data from the table. But

sqlwrite(conn,tablename,data);

returns the error above.

I would very much appreciate any insight you can give me in this regard!

[Geoff Hayes]

Jakob - without knowing exactly what this error message means, are you inserting/writing new data into the table or trying to update existing data. The error message suggest (to me) that you are attempting to write data that already exists within the table.

[Jakob B. Nielsen]

Hi Geoff,

There is a table named 'Declared_values' in the database (it is the one referenced in the error message), into which I post monthly KPI figures. The data I want to put in should append to the existing table, and there is a date-time stamp included in the data so no two entries will ever be identical. So it should be an insert case, not a replace case.

It might be a helpful addition that the same identical code worked fine last a couple of months ago, but I recently got a new work PC. It is the same version of matlab, however, but in case this detail might help ring a bell for someone...