Cannot Add a logical file member. Not sure why

I needed to set up a test environment so that I could run a program that updates a file. The update is actually through a logical file (I didn't write the program I just need to do some testing).

So I created a new library and used CRTDUPOBJ to create the Physical File in the new library. Then I used CRTDUPOBJ to create the logical in the same library even though the original logical didn't reside in the same library as the physical at the time. I assumed (wrongly) that the logical would find the physical in the target library and properly point to it. It doesn't. The logical file still points to the physical file in the production library.

So basically PF1 in Library A has a logical file LF1 in Library B and I wanted to build a test library C where both PF1 and LF1 resided and had the correct access path (pointing only to the file in library C).

So I deleted the logical that I created using CRTDUPOBJ and decided to create the logical from source.

Here is the command I used: ===> CRTLF FILE(LibC/LF1) SRCFILE(LibC/QDDSSRC) MBR(LF1) DTAMBRS((LibC/PF1 (PF1))) MAXMBRS(*NOMAX)

When I run it I get the following error:

File LF1 created in library LibC.
File PF1 in LibC on DTAMBRS not valid.

I don't know why. The LF should reside in library LibC and it should be built over PF1. The source has the following:

R FPF1 PFILE(PF1)
A K PRKEY
A S SPID CMP(EQ 'SP')
A S PMETH CMP(EQ '1')
A S PTYPE CMP(EQ '4')

The PFILE specifies PF1 so I am not sure why the compile complains about adding a DTAMBR. The created logical properly points to the physical located in the same library when I view the access path setting in DSPFD. So I am stumped. What am I missing? Using ADDLFM results in the same error: File PF1 in LibC on DTAMBRS not valid.