PO No in Pending Purchase Bills

Dear Experts, All Readers and Members,

Please help me to resolve my below code for Purchase order no in pending purchase bills


[#Line: TRACKDetail]

Option : TRPRNDetail2 : $$InExportMode
[!Line: TRSCRDetail2]

Next Page : NOT $$DoExplosionsFit

Fields : DTR Date, DTR Name, PO No, DTR Item
Right Fields: DTR OrigQty, DTR OrigBilledQty, DTR PndgQty, DTR PendgBilledQty, DTR Rate, DTR Value
SpaceTop : If $$Line = 1 Then 0 Else 0.45
Option : ExplodeOnEnter
Explode : TRACKSub2Detail : NOT $$InExportMode AND (##ShowBatch OR ##ShowLocation)
Explode : TRACKSubDetail
Explode : TRACK Vouchers : $$InPixelMode AND ($$KeyExplode OR ##ExplodeFlag)
Empty : $IsOptional OR @@TrackForexEmpty

[Field : PO No]
Type: Number
Set as : $Reference
Storage : UDFPONO


[System : UDF]
UDFPONO : Number : 21725



[#Line: TRACKCol1]
Add: Field: Before: DTR PartyTitle : PO NoTitle

[Field: PO NoTitle]
Set as: "PO No"
Width: 6
[#Line: TRACKSubDetail]
Add: Field: Before: DTR PartyName : PO No