Unable to view the details of BAdi method

Question

Guys,
Using SE18, I was able to view the different methods inside a particular BAdi. I had double clikced on a Method name and was able to view method parameters. However, I am not able to view the details of this method by double clikcing on it.Can I go much deeper at this level and just view the code with out an access code ?
IV_PAREAID          Importing     Type     /SAPAPO/TS_PAREAID
IV_INFOPROV          Importing     Type     RSINFOPROV
IV_VERSIOID_TO          Importing     Type     /SAPAPO/VRSIOID
IV_KEYFIGURE_FR          Importing     Type     RSDIOBJNM
IV_RELEASE_TYP          Importing     Type     /SAPAPO/MSDP_RELEASE_TYP
IT_FREE_CHARVALUES     Importing     Type     /SAPAPO/TS_SEL_OBJECT_TAB
IT_TAB               Importing     Type     /SAPAPO/TS_TAB_EXT_TAB
IT_COLS               Importing     Type     /SAPAPO/TS_COLS_EXT_TAB
IT_LINES          Importing     Type     /SAPAPO/TS_LINES_EXT_TAB
ET_MSG_TAB          Exporting     Type     /SAPAPO/TS_BAL_MSG_TAB
CT_MATLOC_TAB_DETAIL     Changing     Type     /SAPAPO/TS_MATLOC_TAB_TAB
CT_PLOB_VALUES          Changing     Type     /SAPAPO/TS_PLOB_VALUES_TAB
CV_CHANGE_SPLIT          Changing     Type     FLAG
Further, what does the prefix  IV, IT, ET, CT, CV stand for and whats their significance ?
Thanks

Answer 1

Its just a naming convention :
Subcomponent name
    Name of a subcomponent of an object type, that is, a parameter or an
    exception. The name can consist of alphanumeric characters and the
    special characters underscore (_) and forward slash (/).
    The name may only contain uppercase letters. The Class Builder
    automatically converts lowercase letters into uppercase. However, if you
    use the Class Library API to insert a name, there is no automatic
    conversion, and an error occurs.
Yes you  can define internal table in Method and its same has writing a program in SE30  like can call function module etc in method.
You can debug BAPI method by entering into mehtod and type  /h (where you write transaction code ) and enter , it will take you to debug mode.
Manish