Your client has installed scalar devices to measure the solar energy generated (Export) and the...

 To apply different validation rules to different measuring components, you can either create two different VEE groups and assign them to the respective measuring components, or use eligibility criteria to specify the conditions under which a VEE rule should be applied or skipped. Both of these options allow you to check the Negative Consumption rule for energy received (import) only, while applying the other validation rules to both measuring components. References:

Oracle Utilities Customer Cloud Service Business User Guide, Chapter 5: Metering, Section 5.3: Validating Meter Data

Oracle Utilities Customer Cloud Service Administrative User Guide, Chapter 6: Configuring Metering, Section 6.2: Configuring Validation, Estimation, and Editing (VEE)