Weird Code Error

tables: mara,eina.

DATA: ze1edp19 like e1edp19 occurs 0 with header line.

DATA: begin of zinteina occurs 0,

matnr like mara-matnr,

idnlf like eina-idnlf,

end of zintEINA.

data: i_mara like mara occurs 0.

CLEAR ZE1EDP19.

clear zinteina.

MOVE segment-SDATA TO ZE1EDP19.

etc......

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Wrote that code in the user exit of INPUT_IDOC_ORDERS.

No syntax error... but in debugging, the system does not recognize the inernal table zinteina nor i_mara but it recognizes ZE1EDP19.