BADI BBP_ECS_PO_OUT_BADI Triggering twice

Hi Experts,

     We are using SRM 7.0 , I implemented the BADI BBP_ECS_PO_OUT_BADI for the attachment transfer from ECC to SRM. The attachment got transferred and created in back end successfully but it seems like the BADI is triggering twice, as the attachment document numbers are being updated twice . Please let me know why this happening

     Thanks in Advance.

Thanks & Regards,

Aishwarya.M