How to assign marketing attributes in bp(CRM-ABAP)

Hi ,

My functional team has configured marketing attribute profile and set and is available in change mode of tcode BP.

But I need to choose the profile from list and then click assign marketing attribute button ,so that the attribute set is visible in BP.

Now inside this attrribute set,I have a field that accepts % value.The resultant % is passed from an incoming parameter available in an inbound interface(via Webmethods).

example : martketing attribute profile 'ZBPMKTATTRIBUTES'  from dropdown listbox,when assign marketing attribute BUTTON is clicked in change mode of BP,

we can see attribute set as 'ZQAS_MP' and when we double-click on this,we see a field which holds space to accept % value.This % value is populated by means of an interface(input parameter).

Can you help me with relevant marketing attribute FM ,so that via the interface,we can make call to marketing attribute FM,which automatcally assigns this attribute profile and attribute set and enters the input % value inside our attribute set,% field and updates the BP?

Please let me know ASAP.Thanks in Advance