Post assest documents using BAPI_ACC_DOCUMENT_POST.

Greetings Experts.

I developed a report using BAPI_ACC_DOCUMENT_POST for posting documents for different posting keys through one input text file. I can able to post for vendor,customer,G/L accounts but for assest i cant. I searched in SCN but not found exact solution so am posting here... How can we post assest documents with posting keys (70 and 75) using the above said F.M? If we can't post using F.M,kindly suggest me how to overcome the scenario.. Thanks, Sai karthik.