Write method in diif ways

Hi,
i heard that i can write method in 2 ways.
1. CALL METHOD
lp_ukm_easy->add
EXPORTING
it_key_mapping = lt_mappings
IMPORTING
es_messages = ls_messages.
2. ls_messages = lp_ukm_easy->add (exporting = lt_mappings) .
but when i write like 2 i have error what i doing wrong ?
Regards

Lots of things wrong.
1. If the method has only one IMPORTING parameter (or one is marked as preferred), you can leave out EXPORTING in the call to the method.
2. If es_messages was a returning parameter you could use
ls_messages = lp_ukm_easy>add( lt_mappings ) .
3. No space between add and (
4. Always have a space inside the brackets.
5. Short form of what you wrote is:
lp_ukm_easy->add( EXPORTING it_key_mapping = lt_mappings
IMPORTING es_messages = ls_messages ).
matt

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Lots of things wrong.
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2. If es_messages was a returning parameter you could use
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