Error when trying to save table revisions SQL 2014 Developer

I have been making some table structure changes in the SQL DB.  I added a new field to one of the SQL tables (tblDevleoper), clicked the 'Save' icon and the revision was saved.

I tried to revise another table (tblProperty_LandFile_History) in the DB but when I clicked the 'Save' I got the screen below.
SQL Error Msg
Why am I seeing the message on this table but not the other table?

In case it is pertinent, tblDevleoper only has three fields and about 10 records.  tblProperty_LandFile_History' has about 50 fields and contains over 10 million records.
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Vaibhav GoelMSBI , SQL ConsultantCommented:
HELLO mlcktmguy

SELECT -->Tools
SELECT -->Options
SELECT -->Designers
SELECT -->Table and Database Designers
SELECT -->Uncheck --> Prevent saving changes that require table re-creation

Please prefer T-SQL Query for these kind of operations.


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mlcktmguyAuthor Commented:
Thanks you.  I am pretty new to SQL Server.  How would I accomplish a structure update to an existing table in T=SQL?
Vaibhav GoelMSBI , SQL ConsultantCommented:

What changes you wanted to accomplish - Adding column?


ALTER TABLE yourtableName
  ADD NewColumnName DataType

ALTER TABLE yourtableName
  DROP COLUMN oldColumnName

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