In clitic doubling contexts, the doubling PP is labelled as PP-PRN and coindexed with a null category *ICH* inside the NP which contains the clitic.

(IP-MAT   (NP-SBJ (PRO Eu))
          (FP já)
          (NP-DAT  (CL lhe)
                   (PP-PRN *ICH*-1)) 
          (VB-D-1S disse)
          (PP-PRN-1  (P a)
                     (NP (NPR você)))
          [...]
          (CP-THT  (C que)
                   (PP-2   (P @em)
                           (NP  (D @o)
                                (N bacalhau)))
                   (CP-THT   (C que)
                             (IP-SUB   (PP *ICH*-2)
                                       (NP-SBJ *pro*)
                                       (VB-D-1P caçámos)
                                       (NP-ACC (NUM-F duas)
[...]
(CORDIAL-SIN; ID VPA32)

( (IP-MAT (CONJ E)
	  (NP-SBJ *exp*-2)
	  (NEG não)
	  (NP-DAT (CL lhe)
		  (PP-PRN *ICH*-1))
	  (VB-SP-1S pareça)
	  (PP-PRN-1 (P a)
		    (NP (NPR VM)))
	  (CP-THT-2 (C que)
		    (IP-SUB (NP-SBJ (PRO eu))
			    (NP-SE (CL me))
			    (VB-P-1S esqueço)
			    (PP (P de)
				(NP (NPR VM)))))
	  (. .))
  (POST SCRIPTUM; ID PS2508,.2))

( (IP-MAT (CONJ e)
	  (NP-SBJ *pro*)
	  (CP-ADV (C como)
		  (IP-SUB (NP-ACC (CL se))
			  (TR-D tinham)
			  (VB-PP passado)
			  (PP (P a)
			      (NP (NPR Castela)))
			  (NP-SBJ (D-P os)
				  (N-P irmãos)
				  (PP (P de)
				      (NP (NPR (NPR Dom) (NPR Fernando) (NPR Mascarenhas)))))))
	  (CODE <paren>)
	  (CP-CAR (WNP-1 (D o) (WPRO que))
		  (IP-SUB (NP-ACC *T*-1)
			  (NP-SBJ (PRO ele))
			  (ADVP (ADV totalmente))
			  (VB-D ignorava)))
	  (CODE <_paren>)
	  (VB-D tiveram)
	  (NP-ACC (CL no)
		  (PP-PRN *ICH*-2))
	  (ADV também)
	  (PP-PRN-2 (P a)
		    (NP (PRO ele)))
	  (PP (P por)
	      (ADJP (ADJ suspeitoso)))
	  (. .))
  (TYCHO-BRAHE; ID B_001_PSD,20.175))

( (IP-MAT (CONJ Mas)
	  (NP-SBJ *pro*)
	  (CP-ADV (C ẽquãto)
		  (IP-SUB (NP-SBJ (PRO eu))
			  (VB-SR ujuer)))
	  (NEG nom)
	  (NP-DAT (CL uo@)
		  (PP-PRN *ICH*-1))
	  (NP-ACC (CL @llo))
	  (VB-R sofrerey)
	  (PP-PRN-1 (PP (P a)
			(NP (PRO uos)))
		    (CONJP (CONJ-NEG nẽ)
			   (PP (P a)
			       (NP (OUTRO outro)))))
	  (. .))
  (WOCHWEL; ID DSG100,.19))

Notice that clitic doubling annotation always involves *ICH*, even when the PP is adjacent to the clitic.

( (IP-MAT (CP-ADV (C Se)
		  (IP-SUB (NP-SBJ (PRO eu))
			  (TR-RA tivera)
			  (ADVP (ADV aqui))
			  (NP-ACC (N soltura))))
	  (, ,)
	  (NP-SBJ (PRO eu))
	  (VB-RA perguntara)
	  (CP-QUE (WNP-1 (D o) (WPRO que))
		  (IP-SUB (NP-SBJ *T*-1)
			  (NP-DAT (CL te)
				  (PP-PRN *ICH*-2))
			  (PP-PRN-2 (P a)
				    (NP (PRO ti)))
			  (VB-P falta)))
[...]
  (POST SCRIPTUM; ID CARDS0131,.6))

( (IP-MAT (NP-SBJ *pro*)
          (VB-P ama-@)
          (NP-ACC (CL @se)
          	  (PP-PRN *ICH*-1))
          (PP-PRN-1 (P a)
	            (NP (PRO si)))
          (. .))
  (TYCHO-BRAHE; ID A_001_PSD,93.2130))

When the doubled clitic is a climbed clitic, the *ICH* is annotated inside the NP which dominates the clitic (and not inside the trace originated by movement).

( (IP-MAT (VB-D Mereço@)
	  (NP-DAT (CL @lhe)
		  (PP-PRN *ICH*-1))
	  (NP-SBJ (PRO eu))
	  (PP-PRN-1 (P a)
		    (NP (NPR VM)))
	  (NP-ACC (D o)
		  (IP-INF (VB comunicar@)
			  (NP-DAT (CL @me))
			  (NP-ACC (Q algum) (N sentimento))
			  (CP-ADV (C se)
				  (IP-SUB (NP-SBJ *pro*)
					  (TR-P tem)))))
	  (, ,)
	  (CP-ADV (C que)
		  (IP-SUB (NP-SBJ (Q-NEG ninguém))
		          (PP (P com)
			      (NP (ADV-R mais) (N-P veras)))
			  (NP-2 (CL o)
				(PP-PRN *ICH*-4))
			  (HV-P há)
			  (PP (P de)
			      (IP-INF (NP-ACC *-2)
				      (VB acompanhar)))
			  (PP-PRN-4 (P a)
			            (NP (NPR VM)))
			  (CP-CMP (WADVP-3 0)
			          (C como)
				  (IP-SUB (ADVP-MSR *T*-3)
				          (NP-SBJ (PRO eu))))))
	  (. !))
  (POST SCRIPTUM; ID CARDS2117,.4))

( (CP-D (PRO Ele)
	(IP-IND (NP-SBJ-1 *exp*)
		(FP até)
		(NP-DAT (CL me))
		(VB-P-3S parece)
		(CP-THT-1 (C que)
			  (IP-SUB (NP-SBJ *pro*)
				  (NP-2 (CL lhe)
					(PP-PRN *ICH*-3))
				  (VB-D-3P chamavam)
				  (IP-SMC (PP-SBJ *-2)
					  (NP-PRD (D-UM um) (N olhar)))
				  (DS -)
				  (PP-PRN-3 (P a)
					    (NP (D-F essa) (N doença))))))
	(. .))
  (CORDIAL-SIN; ID CPT42,20))

This annotation scheme does not apply to cases in which a left dislocated PP is doubled by a resumptive clitic.

( (IP-MAT (NP-SBJ (PRO ela))
	  (PP-LFD (P a)
		  (NP (PRO si) (FP mesma)))
	  (NP-ACC-RSP (CL se))
	  (VB-P namora)
	  (. ,))
  (TYCHO-BRAHE; ID A_001_PSD,93.2128))

( (IP-MAT (NP-SBJ *pro*)
	  (PP-LFD (P a)
		  (NP (PRO si)))
	  (NP-ACC-RSP (CL se))
	  (VB-P busca)
	  (. ,))
  (TYCHO-BRAHE; ID A_001_PSD,93.2129))

( (IP-MAT (IP-MAT (NP-SBJ (Q-P Todos))
		  (TR-P temos)
		  (VB-PP sentido)
		  (NP-ACC (D-F a) (PRO$-F tua) (N falta)))
	  (, ,)
	  (CONJP (CONJ e)
		 (IP-MAT (NP-SBJ *pro*)
			 (PP-LFD (P a)
				 (NP (PRO mim)))
			 (NP-DAT-RSP (CL me))
			 (VB-P dizem)
			 (CP-THT (C que)
				 (IP-SUB (NP-SBJ *pro*)
					 (ET-P estou)
					 (ADJP (ADJ-G triste))))
			 (, ,)
			 (CP-ADV (C porque)
				 (IP-SUB (NP-DAT (CL me))
					 (VB-P falta)
					 (NP-SBJ (D o) (PRO$ meu) (N potinho))))))
	  (. .))
  (POST SCRIPTUM; ID CARDS0075,.4))