Validate AP invoices using API

Hi;

i have to validate AP Invoices using  API in pl/sql.

i use this API

			nRequestId := FND_REQUEST.submit_request(
					'SQLAP', --application =>
					'APXPRVL', -- Program or 'APPRVL'
					null,--Description =>
					SYSDATE,--Start_time =>
					FALSE,--Sub_request =>
					'161', --fnd_profile.VALUE ('ORG_ID =>'), -- Operating Unit (optional)
					'All', -- Match Option
					null,-- lv_tec_batch_name, -- Batch Name (required)
					v_strt_date, -- Invoice Start Date (optional)
					v_end_date, -- Invoice End Date (optional)
					null, -- Vendor ID(optional)
					null, -- Pay group(Optional)
					null, -- Invoice Id (optional)
					null, -- User Id (Optional)
					'No', -- Trace Option (required)