The next example shows a failed synchronization attempt on a MODIFY operation from the source server that could not be synchronized on the destination server. The log displays the LDIF-formatted modification that failed, where the source server added two additional mobilePhone values for an entry. This would cause a schema violation on the destination server because the destination (in this example, PingOne) only allows a single value for mobilePhone.

[17/Nov/2021:15:56:39.294 -0600] category=SYNC severity=SEVERE_WARNING msgID=1893859389 op=6
changeNumber=58 pipe="ds1_to_PingOne_Destination" class="ds1 Users Sync Class"
msg="Detected MODIFY of uid=user.0,ou=People,dc=example,dc=com at ldap://localhost:1389,
but failed to apply this change because: Attribute 'mobilePhone' has 3 values in the entry so
the value cannot be constructed since a single value is required
(id=1893859350 ResourceOperationFailedException.java:126 9.0.0.0-20211117202405.000Z-0bc8a906). 
Details: Source change detail:
dn: uid=user.0,ou=People,dc=example,dc=com
changetype: modify
add: mobile
mobile: +1 111 111 1111
mobile: +1 999 999 9999
-
replace: modifiersName
modifiersName: cn=Directory Manager,cn=Root DNs,cn=config
-
replace: modifyTimestamp
modifyTimestamp: 20211117215425.236Z
-
 Equivalent destination changes:
dn: uid=user.0,ou=People,dc=example,dc=com
changetype: modify
replace: mobilePhone
mobilePhone: +1 164 286 4924
mobilePhone: +1 111 111 1111
mobilePhone: +1 999 999 9999
-
 Full source entry:
dn: uid=user.0,ou=People,dc=example,dc=com
mail: user.0@example.com
initials: AOR
homePhone: +1 295 940 2750
pager: +1 604 109 3407
givenName: Anett
employeeNumber: 0
telephoneNumber: +1 594 307 3495
mobile: +1 164 286 4924
mobile: +1 111 111 1111
mobile: +1 999 999 9999
sn: Rezzik
cn: Anett Rezzik
userPassword: ****
description: This is the description for Anett Rezzik.
street: 22411 Birch Street
st: PA
postalAddress: Anett Rezzik$22411 Birch Street$Rhinelander, PA  98160
uid: user.0
l: Rhinelander
postalCode: 98160
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
Mapped destination entry:
dn: uid=user.0,ou=People,dc=example,dc=com
email: user.0@example.com
mobilePhone: +1 164 286 4924
mobilePhone: +1 111 111 1111
mobilePhone: +1 999 999 9999
name: { "family":"Rezzik", "formatted":"Anett Rezzik", "given":"Anett" }
population: { "name":"Users", "id":"dd24a03b-bde0-463c-ae76-584f5925fe3d" }
primaryPhone: +1 594 307 3495
resourceType: user
username: user.0
"