Problem with alter table in execute immediate

We have PL/SQL scripts which modify the data structure, add data etc to en existing database. These scripts basically ensure that the db is compatible with what the software expects.
The reason for doing it in PL/SQL rather than SQL script is A) The scripts are launched using GUI so that they are more user friendly. sqlplus is launched as a background process which executes these scripts. All the scripts have EXIT FAILURE WHENEVER SQLERROR as first line to ensure that the control does not hang in the sqlplus background process.
Going from one version to other, we have added a few tables to the database and also modified a few tables. since (i think) DDL is not allowed in PL/SQL block, we had to resort to putting them in EXECUTE IMMEDIATE enclosures.
Now for the real question,
If I create a table using EXECUTE IMMEDIATE clause, I can immediately have insert as a next statement to insert data in this table. but, if I alter the table and add a column to the existing table, I cannot immediately add data to that column, it throws an error saying 'invalid identifier'
At code level, the following is allowed :
EXECUTE IMMEDIATE 'CREATE TABLE SP_TEST_TABLE
                         ID     NUMBER,
                         NAME     Varchar2(40)
INSERT INTO SP_TEST_TABLE(ID, NAME) Values(1, 'SP');
but I get error for the following :
EXECUTE IMMEDIATE 'ALTER TABLE SP_TEST_TWO ADD
                    ANOTHER_COLUMN     number
UPDATE     SP_TEST_TWO SET          ANOTHER_COLUMN = 1;
In this case, it says ANOTHER_COLUMN invalid identifier
Does anybody know why?
any workaround will be greatly appreciated.
--SP

Friends,
Thanks to all of you for your help. The spelling mistakes might have occurred becuase i changed the actual script to something 'short and complete' to show the problem.
I could solve the problem by having more than one PL/SQL block within my file. something like :
BEGIN
--alter table statements here
END;
BEGIN
--insert the values in column here.
END;
I am still not sure why the error is presented only on alter table statement and not for create table statement. Probably somebody with the knowledge of oracle internals will be able to throw more light on it. I am trying to get the naswers, if I get the answer, I'll surely post it here.
Regards,
--Saurabh

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