Frame-Relay Point-to-point interface issue

## Topology ##

R5 --- FR --- R1 (s0/0.1 p2p)

           + --- R2 (s0/0.1 p2p)

* R5 uses s0/0 main i/f with frame-relay map

** using GNS3, Cisco 3745 and 12.4(15)T13 Advanced Enterprise

## Configurations ##

R1

interface Serial0/0
 no ip address
 encapsulation frame-relay
 clock rate 2000000
 frame-relay lmi-type ansi
!
interface Serial0/0.1 point-to-point
 ip address 155.1.0.1 255.255.255.0
 snmp trap link-status

R2

interface Serial0/0
 no ip address
 encapsulation frame-relay
 clock rate 2000000
 frame-relay lmi-type ansi
!

interface Serial0/0.1 point-to-point
 ip address 155.1.0.2 255.255.255.0
 snmp trap link-status

R5

interface Serial0/0
 ip address 155.1.0.5 255.255.255.0
 encapsulation frame-relay
 clock rate 2000000
 frame-relay map ip 155.1.0.4 504 broadcast
 frame-relay map ip 155.1.0.3 503 broadcast
 frame-relay map ip 155.1.0.2 502 broadcast
 frame-relay map ip 155.1.0.1 501 broadcast
 no frame-relay inverse-arp
 frame-relay lmi-type ansi

## Issue ##
p2p i/f on R1 and R2 have same issue which they are not able to ping to R5. Configurations seem OK, but there are no frame-relay map entry on them.

 Rack1R2#sh frame map

** no entry of frame-relay map

However, R2 recognizes its DLCI (205) as active.

Rack1R2#sh frame-relay pvc 205

PVC Statistics for interface Serial0/0 (Frame Relay DTE)

DLCI = 205, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0

  input pkts 1055          output pkts 1046         in bytes 350260   
  out bytes 347272         dropped pkts 0           in pkts dropped 0        
  out pkts dropped 0                out bytes dropped 0        
  in FECN pkts 0           in BECN pkts 0           out FECN pkts 0        
  out BECN pkts 0          in DE pkts 0             out DE pkts 0        
  out bcast pkts 1046      out bcast bytes 347272   
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  pvc create time 08:06:24, last time pvc status changed 00:28:50

So, I tried to re-configure "frame-relay interface-dlci" on s0/0.1 i/f of R2. However, R2 said like this below and I was not able to configure dlci value.

Rack1R2(config-subif)#frame-relay interface-dlci 205
%PVC already assigned to interface Serial0/0

## solution ##
I'm still not able to find out the root cause, but I found out the solution for this.

1) delete s0/0.1 interface from router (R1 and R2)
2) configure ip address of se0/0.1 and frame-relay map with dlci to s0/0 main i/f
3) delete ip address and frame-relay map from s0/0 main i/f
4) configure s0/0.1 with ip address and "frame-relay interface-dlci"

interface Serial0/0.1 point-to-point
 ip address 155.1.0.2 255.255.255.0
 snmp trap link-status
 frame-relay interface-dlci 205  

### Comments  ###
After this solution, all ping are successfully done. After all, configurations are same, but re-configuration of "frame-relay interface-dlci" command makes routers work.
I'm guessing like below,
R1 and R2 are configured (no shutdown s0/0 interface, but s0/0 was not able to recognize dlci properly somehow. Then, interface-dlci was not configured from "show running-config" perspective. "frame-relay interface-dlci xxx" was missing in show run, but dlci value was configured actually.
This might be caused by interface configuration occurred first before FR switch configured. Still not sure...