Mapping to BAPI structure

Hi, Dear Friends!

I need to implement the Mapping between mt_sender and BAPI_ACC_DOCUMENT_POST.

Sourse:
Tree			Occurrences
--------------------------------------
mt_sender		1..1
  LINES			1..unbounded
     DETAILS		1..1
	DATE		1..1
	COST_CENTER	0..1
	DEBET		1..1
	CREDIT		1..1
	SUMMA		1..1
	TAX_CODE	0..1
	DESCRIPTION	1..1

Target:
Tree			Occurrences
--------------------------------------
BAPI_ACC_DOCUMENT_POST	1..1
   DOCUMENTHEADER	1..1 
      BUS_ACT		0..1	
      HEADER_TXT	0..1	
      COMP_CODE		0..1	
      DOC_DATE		0..1	
      PSTNG_DATE	0..1	
      DOC_TYPE		0..1	
  ACCOUNTGL		0..1
      item		0..unbounded
	 ITEMNO_ACC	0..1
	 GL_ACCOUNT	0..1
	 TAX_CODE	0..1
	 COST_CENTER    0..1
	 DE_CRE_IND	0..1
  CURRENCYAMOUNT	0..1
      item		0..unbounded
	 ITEMNO_ACC	0..1
	 CURRENCY	0..1
	 AMT_DOCCUR	0..1

In my mapping I need to fill only two subnodes item both in structure ACCOUNGL and CURRENCYAMOUNT of BAPI by the following way:

BAPI_ACC_DOCUMENT_POST			
   DOCUMENTHEADER	1..1
      BUS_ACT		0..1	RFBU
      HEADER_TXT	0..1	mt_sender->LINES->DETAILS->DESCRIPTION
      COMP_CODE		0..1	1000
      DOC_DATE		0..1	mt_sender->LINES->DETAILS->DATE
      PSTNG_DATE	0..1	mt_sender->LINES->DETAILS->DATE
      DOC_TYPE		0..1	SA
  ACCOUNTGL		0..1
      item		0..unbounded (1)
	 ITEMNO_ACC	0..1	1
	 GL_ACCOUNT	0..1	mt_sender->LINES->DETAILS->DEBET
	 TAX_CODE	0..1	H0
	 COST_CENTER    0..1	COST_CENTER
	 DE_CRE_IND	0..1	S
      item		0..unbounded (2) <------------------- ADD SECOND ITEM ----
	 ITEMNO_ACC	0..1	2
	 GL_ACCOUNT	0..1	mt_sender->LINES->DETAILS->CREDIT
	 TAX_CODE	0..1	
	 COST_CENTER    0..1	
	 DE_CRE_IND	0..1	H
  CURRENCYAMOUNT	0..1
      item		0..unbounded (1)
	 ITEMNO_ACC	0..1	1
	 CURRENCY	0..1	UAH
	 AMT_DOCCUR	0..1	mt_sender->LINES->DETAILS->SUMMA
      item		0..unbounded (2) <------------- ADD SECOND ITEM ----
	 ITEMNO_ACC	0..1	2
	 CURRENCY	0..1	UAH
	 AMT_DOCCUR	0..1	mt_sender->LINES->DETAILS-> -SUMMA

Please advice me how to add second items to ACCOUNTGL and CURRENCYAMOUNT in order to specify the different relations?

Thank you in advance,

Maslova Natalia.