PBP behaves just as documented. I should have looked under IF statement.

5.35 IF..THEN
IF Comp {AND/OR Comp...} THEN Label
IF Comp {AND/OR Comp...} THEN Statement...
IF Comp {AND/OR Comp...} THEN
Statement...
{ELSEIF Comp {AND/OR Comp...} THEN
Statement...}
{ELSE
Statement...}
ENDIF
Robert