Error when call 'BAPI_REQUIREMENTS_CHANGE'

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Dear all,

now my program problem ...

when i upload excel file and convert date from excel to sytem SAP

i call function 'CONVERT_DATE_TO_INTERNAL', this ok

but when i call funtion 'BAPI_REQUIREMENTS_CHANGE'

data: begin of SCHEDULE_IN occurs 0,

DATE_TYPE like BAPISSHDIN-DATE_TYPE,

REQ_DATE like BAPISSHDIN-REQ_DATE,

REQ_QTY like BAPISSHDIN-REQ_QTY,

end of SCHEDULE_IN.

READ TABLE i_upload INDEX 1.

CALL FUNCTION 'BAPI_REQUIREMENTS_CHANGE'

EXPORTING

MATERIAL = i_upload-MATERIAL

PLANT = i_upload-plant

REQUIREMENTSTYPE = ' '

VERSION = '00'

REQMTSPLANNUMBER = ' '

VERS_ACTIV = 'X'

TABLES

REQUIREMENTS_SCHEDULE_IN = SCHEDULE_IN.

commit work.

ENDFORM.

ERROR with :

***The call to the function ***module "BAPI_REQUIREMENTS_CHANGE" is incorrect:

***In the function module interface, you can specify only

***fields of a specific type and length ***under "REQUIREMENTS_SCHEDULE_IN".

***Although the currently specified field

**"SCHEDULE_IN" is the correct type, its length is incorrect.***

pls help me solve

thanks so much/Tham.