generate a certificate

Good day

we are currently having an issue while generating a certificate with the customer, we used a self signed certificate in development and UAT environment and need to use a bank certificate in the production environment , i have two questions here

1)is the self signed certificate might cause any issue in the future in the integration with other systems such as LDAB??

2) in the generation of csr in the production environment we are using the following commands

keytool -genkey -alias siebel -keystore siebelkeystore.jks -keyalg RSA -sigalg SHA256withRSA -keysize 2048 -validity 1825 -dname "cn=*.bdc.bank.local"

keytool -certreq -alias siebel -keystore siebelkeystore.jks -file siebel.csr