The sub pcr's are not in the schema. The pcr ZLE1 in the schema calls the sub pcr's.
It is similar to the concept of XPPF calling sub pcr's XPP), etc. Only XPPF is in sub schema XAL0.
Alternative to use sub PCR's is to replace the PCR's ZLU1 - 3 & ZLUC as other ESGG's of ZLE1. This method reduces the no.of PCR's.
In other words, the main one is with */****, the lines in ZLU1 would be in say pcr ZLE1 J/****, ZLU2 in K, ZLU3 in L and ZLUC in M
PCR ZLE1 will invoke as
PCY ZLE1J PCY ZLE1K PCY ZLE1L PCY ZLE1M
Note if the main PCR has w/t's like */xxxx, */yyyy, then you need to call with GCYG or PCYG. (see help text for GCY - same applies for PCY)