PPDS deleting SNP orders

Hello experts ,

We have SNP & PPDS implemented in our APO setup. We run CTM with fixed pegging. We do weekly planning run & the sequence includes

1. Deletes

2. PPDS run

3. CTM run

4.SNP run for components

& then there is daily PPDS planning run .

Issue : Once the weekly planning run is completed on Saturday our planning books looks good . But when PPDS runs on Sunday night , it deletes the CTM created orders right after the PPDS horizon (2-3 weeks) creating a shortage which gets carried over till the end of horizon.

Our horizons are :

SNP = 45

STH= 14

PPDS = 120

Please advise if anything is wrong with our planning run setup & sequence ? Are we missing anything here . Happy to provide additional inputs .

Many thanks !

Regards,

Afroz