Can we add new attachment outside SC(like from custom page on SoCo PO) to existing SC ?

Hi Experts,

Need your expert advice on the below requirement.

We have created a custom view in SoCo PO page. There we have a New custom view called Notes&attachement.which contains same value from Notes & attachment of Shopping Cart.

We are updating existing Notes of SC by FM 'bbp_pd_sc_update' and same is reflected in SC of same item guid & same header guid.

Similarly trying to add a new Attachment to already existing attachment. New attachment is reflected in custom page and the describe link is working perfectly. but if come out of SoCo page , lets say in SC the new added attachment is shown but display_url,phio_size,disp_url etc are not stored properly in DB.

in bbp_pd transaction every thing looks same for new and existing attachment. we are using same FM 'BBP_PD_SC_UPDATE' by passing new internal table of attachment in import statement. Even 'BBP_PROC_DOC_UPADTE' has same result that is new attachment is partially updated.

Suppose, SC has one attachment at the time of creation. then adding a new attachment in custom view of SoCo PO page then every thing works fine in SoCo PO page but out of that SoCo PO or in SC the newly added attachment is not properly updated.

I have added mime_type,phio_size,disp_url,file_name,file_ext,ev_content,phio_content of new attachment in existing attachment internal table and calling above FM for update.

Can we  add new attachment outside SC to existing SC ? if yes , then how?

Thanks,

Partha