-671 THE BUFFERPOOL ATTRIBUTE OF THE TABLE SPACE CANNOT BE ALTERED AS SPECIFIED BECAUSE IT WOULD CHANGE THE PAGE SIZE OF THE TABLE SPACE

Explanation
 For example, the change to the buffer pool attribute
for the table space specified in the ALTER TABLESPACE statement would
change the page size of the table space—either from 4KB to 32KB, 8KB
to 16KB, or vice versa.
 Use of the ALTER TABLESPACE statement
to change the page size of a table space is not permitted.

System action
 The statement cannot be processed. The
table space definition was not altered.

Programmer response
 For example, if the table space uses one
of the 4KB buffer pools (for example, BP0, BP1, or BP2), it can be
reassigned to one of the other 4KB buffer pools (but not buffer pool
BP32K). If, however, it is assigned to buffer pool BP32K, the buffer
pool assignment cannot be subsequently altered.

SQLSTATE
 53040