10.11.6 Server won't kill bad DHCP reservation

[degudejung]

Hi,
I am trying to manually move my DHCP from router to Mac mini running El Capital server. In DHCP I created one test reservation "Testgerät" before setting up the actual ones. Now I can't remove it. whenever I delete it via GUI, it immediately pops back up after a second.

I tried editing bootptab but I couldn't even find the file in /etc/.

I successfully deleted booted.plist but that didn't solve the issue.

serveradmin settings dhcp results:

dhcp:static_maps:_array_id:DCB1F8C1-B11B-4F0E-9A33-71ED9B766049:ip_address:_array_index:0 = "192.168.100.149"
dhcp:static_maps:_array_id:DCB1F8C1-B11B-4F0E-9A33-71ED9B766049:en_address:_array_index:0 = "18:af:61:d2:1d:e4"
dhcp:static_maps:_array_id:DCB1F8C1-B11B-4F0E-9A33-71ED9B766049:name = "Testgerät"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:WINS_primary_server = ""
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:dhcp_router = "192.168.100.1"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:WINS_secondary_server = ""
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:net_range_start = "192.168.100.2"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:net_range_end = "192.168.100.253"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:dhcp_domain_name = "no-dns-available.example.com"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:dhcp_domain_name_server:_array_index:0 = "127.0.0.1"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:dhcp_domain_name_server:_array_index:1 = "192.168.100.1"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:lease_max = 3600
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:net_mask = "255.255.255.0"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:dhcp_ldap_url = _empty_array
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:WINS_node_type = "NOT_SET"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:dhcp_enabled = yes
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:WINS_NBDD_server = ""
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:net_address = "192.168.100.0"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:WINS_scope_id = ""
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:descriptive_name = "192.168.100 LAN"
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:dhcp_domain_search = _empty_array
dhcp:subnets:_array_id:5C93B281-5B8B-4823-96A0-041BFC3EAA86:selected_port_name = "en0"
dhcp:subnet_defaults:logVerbosity = "MEDIUM"
dhcp:subnet_defaults:routers:en0 = "192.168.100.1"
dhcp:subnet_defaults:WINS_node_type_list:_array_index:0 = "BROADCAST_B_NODE"
dhcp:subnet_defaults:WINS_node_type_list:_array_index:1 = "HYBRID_H_NODE"
dhcp:subnet_defaults:WINS_node_type_list:_array_index:2 = "NOT_SET"
dhcp:subnet_defaults:WINS_node_type_list:_array_index:3 = "PEER_P_NODE"
dhcp:subnet_defaults:WINS_node_type_list:_array_index:4 = "MIXED_M_NODE"
dhcp:subnet_defaults:WINS_node_type = "NOT_SET"
dhcp:subnet_defaults:dhcp_domain_name = "no-dns-available.example.com"
dhcp:subnet_defaults:logVerbosityList:_array_index:0 = "LOW"
dhcp:subnet_defaults:logVerbosityList:_array_index:1 = "MEDIUM"
dhcp:subnet_defaults:logVerbosityList:_array_index:2 = "HIGH"
dhcp:subnet_defaults:dhcp_domain_name_server:_array_index:0 = "127.0.0.1"
dhcp:subnet_defaults:dhcp_domain_name_server:_array_index:1 = "192.168.100.1"
dhcp:subnet_defaults:selected_port_key = "en0"
dhcp:subnet_defaults:selected_port_key_list:_array_index:0 = "en0"
dhcp:subnet_defaults:selected_port_key_list:_array_index:1 = "fw0"
dhcp:subnet_defaults:selected_port_key_list:_array_index:2 = "en1"
dhcp:subnet_defaults:selected_port_key_list:_array_index:3 = "bridge0"
dhcp:logging_level = "MEDIUM"

Does anyone have an idea of how I could "reset" the DHCP or kill this "static map"?

thanks in advance
degudejung
[doublepost=1492215140][/doublepost]oh and maybe that also helps. DHCP log says:

Apr 15 01:00:46 kreuter servermgr_dhcp[1470]: servermgr_dhcp:bootp config:Error:Unable to update/remove record with id DCB1F8C1-B11B-4F0E-9A33-71ED9B766049 because 2 records found.