Call transaction returning 1001 message

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Dear Abapers,

I am updating batch information (not at the item level but at component level) in PO through ME22.

CALL TRANSACTION 'ME22' USING BDCDATA

MODE 'N'

UPDATE 'S'

MESSAGES INTO GT_ME22_MESSTAB.

When i execute in all screen mode it is updating the batch information in item components (Subrc is 0). But when i execute in No screen mode program is not updating the information and subrc value is 1001.

In the help it says : for mode N

Processing without display of screens. If a breakpoint is reached in one of the called transactions, processing is terminated with sy-subrc same as 1001. The field sy-msgty contains "S", sy-msgid contains "00", sy-msgno contains "344", sy-msgv1 contains "SAPMSSY3", and sy-msgv2 contains "0131".

There are no break points set any where....

Thanks in advance.

Sanjay.