MediaWiki:Apihelp-block-param-reblock
If the user is already blocked by a single block, overwrite the existing block. If the user is blocked more than once, this will fail—use the id parameter instead to specify which block to overwrite.
If the user is already blocked by a single block, overwrite the existing block. If the user is blocked more than once, this will fail—use the id parameter instead to specify which block to overwrite.